pcm_resample: fixed typo in libsamplerate runtime check

The string comparison should be "!= 0", not "== 0".  Ouch.

src/pcm_resample.c

@@ -31,7 +31,7 @@ static bool
 pcm_resample_lsr_enabled(void)
 {
 	return strcmp(config_get_string(CONF_SAMPLERATE_CONVERTER, ""),
-		      "internal") == 0;
+		      "internal") != 0;
 }
 #endif