[Patch] Check sound_alloc_mixerdev() failure in sound/oss/nm256_audio.c

[Eric Sesterhenn <snakebyte@gmx.de>]

hi,

this was spotted by coverity, bug id #395.
When sound_alloc_mixerdev() fails it returns a
negative value, which the driver fails to check.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>

--- linux-2.6.17-rc5/sound/oss/nm256_audio.c.orig	2006-06-01 11:49:23.000000000 +0200
+++ linux-2.6.17-rc5/sound/oss/nm256_audio.c	2006-06-01 11:49:57.000000000 +0200
@@ -974,7 +974,7 @@ nm256_install_mixer (struct nm256_info *
 	return -1;
 
     mixer = sound_alloc_mixerdev();
-    if (num_mixers >= MAX_MIXER_DEV) {
+    if ((num_mixers >= MAX_MIXER_DEV) || (num_mixers < 0)) {
 	printk ("NM256 mixer: Unable to alloc mixerdev\n");
 	return -1;
     }


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