Fix [-Wimplicit-fallthrough] warnings in FPM SAPI

Author: Girgias

sapi/fpm/fpm/fpm_conf.c

@@ -307,6 +307,7 @@ static char *fpm_conf_set_time(zval *value, void **config, intptr_t offset) /* {
 		case 's' : /* s is the default suffix */
 			val[len-1] = '\0';
 			suffix = '0';
+			fallthrough;
 		default :
 			if (suffix < '0' || suffix > '9') {
 				return "unknown suffix used in time value";

sapi/fpm/fpm/fpm_process_ctl.c

@@ -217,21 +217,24 @@ void fpm_pctl(int new_state, int action) /* {{{ */
 				case FPM_PCTL_STATE_RELOADING :
 					/* 'reloading' can be overridden by 'finishing' */
 					if (new_state == FPM_PCTL_STATE_FINISHING) break;
+					fallthrough;
 				case FPM_PCTL_STATE_FINISHING :
 					/* 'reloading' and 'finishing' can be overridden by 'terminating' */
 					if (new_state == FPM_PCTL_STATE_TERMINATING) break;
+					fallthrough;
 				case FPM_PCTL_STATE_TERMINATING :
 					/* nothing can override 'terminating' state */
 					zlog(ZLOG_DEBUG, "not switching to '%s' state, because already in '%s' state",
 						fpm_state_names[new_state], fpm_state_names[fpm_state]);
 					return;
+				/* TODO Add EMPTY_SWITCH_DEFAULT_CASE? */
 			}
 
 			fpm_signal_sent = 0;
 			fpm_state = new_state;
 
 			zlog(ZLOG_DEBUG, "switching to '%s' state", fpm_state_names[fpm_state]);
-			/* fall down */
+			fallthrough;
 
 		case FPM_PCTL_ACTION_TIMEOUT :
 			fpm_pctl_action_next();