fix trivial compiler warnings

src/switch_core_file.c

@@ -252,7 +252,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_file_read(switch_file_handle_t *fh,
 
   top:
 
-	if (fh->max_samples > 0 && fh->samples_in >= fh->max_samples) {
+	if (fh->max_samples > 0 && fh->samples_in >= (switch_size_t)fh->max_samples) {
 		*len = 0;
 		return SWITCH_STATUS_FALSE;
 	}

src/switch_core_sqldb.c

@@ -1392,7 +1392,7 @@ SWITCH_DECLARE(int) switch_sql_queue_manager_size(switch_sql_queue_manager_t *qm
 SWITCH_DECLARE(switch_status_t) switch_sql_queue_manager_stop(switch_sql_queue_manager_t *qm)
 {
 	switch_status_t status = SWITCH_STATUS_FALSE;
-	int i;
+	uint32_t i;
 
 	if (qm->thread_running) {
 		qm->thread_running = 0;