MINOR: freq_ctr: unify freq_ctr and freq_ctr_period into freq_ctr

Both structures are identical except the name of the field starting
the period and its description. Let's call them all freq_ctr and the
period's start "curr_tick" which is generic.

This is only a temporary change and fields are expected to remain
the same with no code change (verified).
diff --git a/src/freq_ctr.c b/src/freq_ctr.c
index d68a784..3d14163 100644
--- a/src/freq_ctr.c
+++ b/src/freq_ctr.c
@@ -37,7 +37,7 @@
 		__ha_compiler_barrier();
 		_past = ctr->prev_ctr;
 		__ha_compiler_barrier();
-		_curr_sec = ctr->curr_sec;
+		_curr_sec = ctr->curr_tick;
 		__ha_compiler_barrier();
 		if (_curr_sec & 0x80000000)
 			continue;
@@ -45,7 +45,7 @@
 		__ha_compiler_barrier();
 		past = ctr->prev_ctr;
 		__ha_compiler_barrier();
-		curr_sec = ctr->curr_sec;
+		curr_sec = ctr->curr_tick;
 		__ha_compiler_barrier();
 		if (_curr == curr && _past == past && _curr_sec == curr_sec)
 			break;
@@ -80,7 +80,7 @@
 		__ha_compiler_barrier();
 		_past = ctr->prev_ctr;
 		__ha_compiler_barrier();
-		_curr_sec = ctr->curr_sec;
+		_curr_sec = ctr->curr_tick;
 		__ha_compiler_barrier();
 		if (_curr_sec & 0x80000000)
 			continue;
@@ -88,7 +88,7 @@
 		__ha_compiler_barrier();
 		past = ctr->prev_ctr;
 		__ha_compiler_barrier();
-		curr_sec = ctr->curr_sec;
+		curr_sec = ctr->curr_tick;
 		__ha_compiler_barrier();
 		if (_curr == curr && _past == past && _curr_sec == curr_sec)
 			break;
@@ -127,7 +127,7 @@
 		__ha_compiler_barrier();
 		_past = ctr->prev_ctr;
 		__ha_compiler_barrier();
-		_curr_sec = ctr->curr_sec;
+		_curr_sec = ctr->curr_tick;
 		__ha_compiler_barrier();
 		if (_curr_sec & 0x80000000)
 			continue;
@@ -135,7 +135,7 @@
 		__ha_compiler_barrier();
 		past = ctr->prev_ctr;
 		__ha_compiler_barrier();
-		curr_sec = ctr->curr_sec;
+		curr_sec = ctr->curr_tick;
 		__ha_compiler_barrier();
 		if (_curr == curr && _past == past && _curr_sec == curr_sec)
 			break;
@@ -176,7 +176,7 @@
  * read_freq_ctr_period() to avoid reporting ups and downs on low-frequency
  * events when the past value is <= 1.
  */
-ullong freq_ctr_total(struct freq_ctr_period *ctr, uint period, int pend)
+ullong freq_ctr_total(struct freq_ctr *ctr, uint period, int pend)
 {
 	ullong curr, past;
 	uint curr_tick;
diff --git a/src/peers.c b/src/peers.c
index dd3d9dd..2ebb107 100644
--- a/src/peers.c
+++ b/src/peers.c
@@ -713,7 +713,7 @@
 					break;
 				}
 				case STD_T_FRQP: {
-					struct freq_ctr_period *frqp;
+					struct freq_ctr *frqp;
 
 					frqp = &stktable_data_cast(data_ptr, std_t_frqp);
 					intencode((unsigned int)(now_ms - frqp->curr_tick), &cursor);
@@ -1667,11 +1667,11 @@
 			break;
 
 		case STD_T_FRQP: {
-			struct freq_ctr_period data;
+			struct freq_ctr data;
 
-			/* First bit is reserved for the freq_ctr_period lock
+			/* First bit is reserved for the freq_ctr lock
 			Note: here we're still protected by the stksess lock
-			so we don't need to update the update the freq_ctr_period
+			so we don't need to update the update the freq_ctr
 			using its internal lock */
 
 			data.curr_tick = tick_add(now_ms, -decoded_int) & ~0x1;
diff --git a/src/stick_table.c b/src/stick_table.c
index e305a44..1fe60a0 100644
--- a/src/stick_table.c
+++ b/src/stick_table.c
@@ -3627,7 +3627,7 @@
 	int data_type;
 	int cur_arg;
 	void *ptr;
-	struct freq_ctr_period *frqp;
+	struct freq_ctr *frqp;
 
 	if (!*args[4])
 		return cli_err(appctx, "Key value expected\n");
@@ -3764,9 +3764,9 @@
 				 * push measures without having to update them too often.
 				 */
 				frqp = &stktable_data_cast(ptr, std_t_frqp);
-				/* First bit is reserved for the freq_ctr_period lock
+				/* First bit is reserved for the freq_ctr lock
 				   Note: here we're still protected by the stksess lock
-				   so we don't need to update the update the freq_ctr_period
+				   so we don't need to update the update the freq_ctr
 				   using its internal lock */
 				frqp->curr_tick = now_ms & ~0x1;
 				frqp->prev_ctr = 0;
diff --git a/src/stream.c b/src/stream.c
index bdc974c..6c60cd4 100644
--- a/src/stream.c
+++ b/src/stream.c
@@ -424,7 +424,7 @@
 	s->buffer_wait.target = s;
 	s->buffer_wait.wakeup_cb = stream_buf_available;
 
-	s->call_rate.curr_sec = s->call_rate.curr_ctr = s->call_rate.prev_ctr = 0;
+	s->call_rate.curr_tick = s->call_rate.curr_ctr = s->call_rate.prev_ctr = 0;
 	s->pcli_next_pid = 0;
 	s->pcli_flags = 0;
 	s->unique_id = IST_NULL;