res_musiconhold: moh general section is a class and issues warning

* res_musiconhold.c: Ensure the general section is not treated as
a moh class.

ASTERISK-26353 #close

Change-Id: Ia3dbd11ea2b43ab3e6c820a9827811dd24bea82d

res/res_musiconhold.c

@@ -1748,6 +1748,7 @@ static int load_moh_classes(int reload)
 					ast_log(LOG_WARNING, "Unknown option '%s' in [general] section of musiconhold.conf\n", var->name);
 				}
 			}
+			continue;
 		}
 
 		if (!(class = moh_class_malloc())) {