CLEANUP: mworker: simplify mworker_free_child()

Remove useless checks and simplify the function.
diff --git a/src/mworker.c b/src/mworker.c
index ac1177f..8b0b06b 100644
--- a/src/mworker.c
+++ b/src/mworker.c
@@ -603,26 +603,17 @@
 
 void mworker_free_child(struct mworker_proc *child)
 {
+	int i;
+
 	if (child == NULL)
 		return;
 
-	if (child->command) {
-		int i;
-
-		for (i = 0; child->command[i]; i++) {
-			if (child->command[i]) {
-				ha_free(&child->command[i]);
-			}
+	for (i = 0; child->command && child->command[i]; i++)
+		ha_free(&child->command[i]);
 
-		}
-		ha_free(&child->command);
-	}
-	if (child->id) {
-		ha_free(&child->id);
-	}
-	if (child->version) {
-		ha_free(&child->version);
-	}
+	ha_free(&child->command);
+	ha_free(&child->id);
+	ha_free(&child->version);
 	free(child);
 }