sound: OSS: keep index within bounds of midi_devs[]

When the {orig,midi}_dev equals num_midis, that's one too
large already.

Signed-off-by: Roel Kluin <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/oss/midi_synth.c

···
 	int             err;
 	struct midi_input_info *inc;
 
-	if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
+	if (orig_dev < 0 || orig_dev >= num_midis || midi_devs[orig_dev] == NULL)
 		return -ENXIO;
 
 	midi2synth[orig_dev] = dev;

sound/oss/mpu401.c

···
 
 	midi_dev = synth_devs[dev]->midi_dev;
 
-	if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev] == NULL)
+	if (midi_dev < 0 || midi_dev >= num_midis || midi_devs[midi_dev] == NULL)
 		return -ENXIO;
 
 	devc = &dev_conf[midi_dev];