CLEANUP: spoe: fix typo on `var_check_arg` comment

there was an extra `s` added to the `var_check_arg` function

Signed-off-by: William Dauchy <wdauchy@gmail.com>
diff --git a/src/flt_spoe.c b/src/flt_spoe.c
index 45370fe..bfd6f4f 100644
--- a/src/flt_spoe.c
+++ b/src/flt_spoe.c
@@ -4178,7 +4178,7 @@
 		arg.type = ARGT_STR;
 		arg.data.str.area = trash.area;
 		arg.data.str.data = trash.data;
-		arg.data.str.size = 0; /* Set it to 0 to not release it in vars_check_args() */
+		arg.data.str.size = 0; /* Set it to 0 to not release it in vars_check_arg() */
 		if (!vars_check_arg(&arg, err)) {
 			memprintf(err, "SPOE agent '%s': failed to register variable %s.%s (%s)",
 				  curagent->id, curagent->var_pfx, curagent->var_on_error, *err);
@@ -4195,7 +4195,7 @@
 		arg.type = ARGT_STR;
 		arg.data.str.area = trash.area;
 		arg.data.str.data = trash.data;
-		arg.data.str.size = 0;  /* Set it to 0 to not release it in vars_check_args() */
+		arg.data.str.size = 0;  /* Set it to 0 to not release it in vars_check_arg() */
 		if (!vars_check_arg(&arg, err)) {
 			memprintf(err, "SPOE agent '%s': failed to register variable %s.%s (%s)",
 				  curagent->id, curagent->var_pfx, curagent->var_t_process, *err);
@@ -4212,7 +4212,7 @@
 		arg.type = ARGT_STR;
 		arg.data.str.area = trash.area;
 		arg.data.str.data = trash.data;
-		arg.data.str.size = 0;  /* Set it to 0 to not release it in vars_check_args() */
+		arg.data.str.size = 0;  /* Set it to 0 to not release it in vars_check_arg() */
 		if (!vars_check_arg(&arg, err)) {
 			memprintf(err, "SPOE agent '%s': failed to register variable %s.%s (%s)",
 				  curagent->id, curagent->var_pfx, curagent->var_t_process, *err);
@@ -4418,7 +4418,7 @@
 		arg.type = ARGT_STR;
 		arg.data.str.area = trash.area;
 		arg.data.str.data = trash.data;
-		arg.data.str.size = 0;  /* Set it to 0 to not release it in vars_check_args() */
+		arg.data.str.size = 0;  /* Set it to 0 to not release it in vars_check_arg() */
 		if (!vars_check_arg(&arg, err)) {
 			memprintf(err, "SPOE agent '%s': failed to register variable %s.%s (%s)",
 				  curagent->id, curagent->var_pfx, vph->name, *err);