FS-11903: Fix errors reported by PVS-Studio Static Code Analyzer for mod_tone_stream

src/mod/formats/mod_tone_stream/mod_tone_stream.c

@@ -142,7 +142,7 @@ static switch_status_t tone_stream_file_open(switch_file_handle_t *handle, const
 	if ((tmp = (char *)switch_stristr(";loops=", tonespec))) {
 		*tmp = '\0';
 		tmp += 7;
-		if (tmp) {
+		if (*tmp) {
 			loops = atoi(tmp);
 			switch_buffer_set_loops(audio_buffer, loops);
 		}