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Fix macOS default audio output device if the config string is empty

--- a/src/ft2_audioselector.c

+++ b/src/ft2_audioselector.c

@@ -54,6 +54,11 @@

 			devString[devStringLen-1]  = '\0';

 		devString[devStringLen+1] = '\0'; // UTF-8 needs double null termination

+#if defined(__APPLE__)

+		if (devString[0] == '\0')

+			return NULL; // macOS SDL2 locks up indefinitely if fed an empty string for device name

+#endif

+

 		fclose(f);

 	}