[patch] ALSA: hda - potential (but unlikely) uninitialized variable

[Dan Carpenter <dan.carpenter@oracle.com>]

This function is a bit unusual because it accepts negative values as
"conn_len".  It's theoretically possible for both "cache_len" and
"conn_len" to be -ENOSPC and in that case we would oops trying to run
memcmp() on the uninitialized "list" pointer.

My static checker complains about this.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index ce5a6da..387fdfc 100644
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -556,8 +556,8 @@ static void print_conn_list(struct snd_info_buffer *buffer,
 
 	/* Get Cache connections info */
 	cache_len = snd_hda_get_conn_list(codec, nid, &list);
-	if (cache_len != conn_len
-			|| memcmp(list, conn, conn_len)) {
+	if (cache_len < 0 || cache_len != conn_len ||
+	    memcmp(list, conn, conn_len) != 0) {
 		snd_iprintf(buffer, "  In-driver Connection: %d\n", cache_len);
 		if (cache_len > 0) {
 			snd_iprintf(buffer, "    ");