[PATCH] remove redundant NULL checks before kfree() in sound/ and avoid casting pointers about to be kfree()'ed

Checking a pointer for NULL before calling kfree() on it is redundant,
kfree() deals with NULL pointers just fine.
This patch removes such checks from sound/

This patch also makes another, but closely related, change.
It avoids casting pointers about to be kfree()'ed.

Signed-off-by: Jesper Juhl <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

sound/oss/ad1848.c

···
 		
 	if (devc != NULL)
 	{
-		if(audio_devs[dev]->portc!=NULL)
-			kfree(audio_devs[dev]->portc);
+		kfree(audio_devs[dev]->portc);
 		release_region(devc->base, 4);
 
 		if (!share_dma)

sound/oss/ad1889.c

···
 
 	for (j = 0; j < AD_MAX_STATES; j++) {
 		dmabuf = &dev->state[j].dmabuf;
-		if (dmabuf->rawbuf != NULL) 
-			kfree(dmabuf->rawbuf);
+		kfree(dmabuf->rawbuf);
 	}
 
 	kfree(dev);

sound/oss/dmasound/dmasound_awacs.c

···
 	release_OF_resource(awacs_node, 1);
 	release_OF_resource(awacs_node, 2);
 
-	if (awacs_tx_cmd_space)
-		kfree(awacs_tx_cmd_space);
-	if (awacs_rx_cmd_space)
-		kfree(awacs_rx_cmd_space);
-	if (beep_dbdma_cmd_space)
-		kfree(beep_dbdma_cmd_space);
-	if (beep_buf)
-		kfree(beep_buf);
+	kfree(awacs_tx_cmd_space);
+	kfree(awacs_rx_cmd_space);
+	kfree(beep_dbdma_cmd_space);
+	kfree(beep_buf);
 #ifdef CONFIG_PMAC_PBOOK
 	pmu_unregister_sleep_notifier(&awacs_sleep_notifier);
 #endif
···
 #endif
 
 	if ((write_sq.max_count + 1) > number_of_tx_cmd_buffers) {
-		if (awacs_tx_cmd_space)
-			kfree(awacs_tx_cmd_space);
+		kfree(awacs_tx_cmd_space);
 		number_of_tx_cmd_buffers = 0;
 
 		/* we need nbufs + 1 (for the loop) and we should request + 1
···
 #endif
 
 	if ((read_sq.max_count+1) > number_of_rx_cmd_buffers ) {
-		if (awacs_rx_cmd_space)
-			kfree(awacs_rx_cmd_space);
+		kfree(awacs_rx_cmd_space);
 		number_of_rx_cmd_buffers = 0;
 
 		/* we need nbufs + 1 (for the loop) and we should request + 1 again
···
 	beep_buf = (short *) kmalloc(BEEP_BUFLEN * 4, GFP_KERNEL);
 	if (beep_buf == NULL) {
 		printk(KERN_ERR "dmasound_pmac: no memory for beep buffer\n");
-		if( beep_dbdma_cmd_space ) kfree(beep_dbdma_cmd_space) ;
+		kfree(beep_dbdma_cmd_space) ;
 		return -ENOMEM ;
 	}
 	return 0 ;

sound/oss/emu10k1/midi.c

···
 	card = midi_devs[dev]->devc;
 	emu10k1_mpuout_close(card);
 
-	if (card->seq_mididev) {
-		kfree(card->seq_mididev);
-		card->seq_mididev = NULL;
-	}
+	kfree(card->seq_mididev);
+	card->seq_mididev = NULL;
 }
 
 int emu10k1_seq_midi_out(int dev, unsigned char midi_byte)

sound/oss/emu10k1/passthrough.c

···
 				sblive_writeptr(card, SPCS0 + i, 0, pt->old_spcs[i]);
 		}
 		pt->state = PT_STATE_INACTIVE;
-		if(pt->buf)
-			kfree(pt->buf);
+		kfree(pt->buf);
 	}
 }
 

sound/oss/maestro.c

···
 	}
 
 rec_return_free:
-	if(combbuf) kfree(combbuf);
+	kfree(combbuf);
 	return ret;
 }
 

sound/oss/mpu401.c

···
 		p=mpu401_synth_operations[n];
 		sound_unload_mididev(n);
 		sound_unload_timerdev(hw_config->slots[2]);
-		if(p)
-			kfree(p);
+		kfree(p);
 	}
 }
 

sound/oss/sb_common.c

···
 	}
 	else
 		release_region(hw_config->io_base, 16);
-	if(detected_devc)
-		kfree(detected_devc);
+
+	kfree(detected_devc);
 }
 
 /*