staging/lustre/llite: Fix a compile warning.

Quiet the warning below in Lustre code.
Actually the warning is invalid since we either always assign the symname in ll_readlink_internal or return an error there and then the following rc check would assign symlink variable explicitly.

In file included from /home/green/bk/linux/drivers/staging/lustre/lustre/llite/../include/linux/lustre_compat25.h:41:0,
from /home/green/bk/linux/drivers/staging/lustre/lustre/llite/../include/linux/lvfs.h:48,
from /home/green/bk/linux/drivers/staging/lustre/lustre/llite/../include/lvfs.h:45,
from /home/green/bk/linux/drivers/staging/lustre/lustre/llite/../include/obd_support.h:41,
from /home/green/bk/linux/drivers/staging/lustre/lustre/llite/../include/obd_class.h:40,
from /home/green/bk/linux/drivers/staging/lustre/lustre/llite/../include/linux/lustre_lite.h:49, from /home/green/bk/linux/drivers/staging/lustre/lustre/llite/../include/lustre_lite.h:45,
from /home/green/bk/linux/drivers/staging/lustre/lustre/llite/symlink.c:42:
/home/green/bk/linux/drivers/staging/lustre/lustre/llite/symlink.c: In function ‘ll_follow_link’:
/home/green/bk/linux/include/linux/namei.h:88:29: warning: ‘symname’ may be used uninitialized in this function [-Wmaybe-uninitialized]

  nd->saved_names[nd->depth] = path;
                             ^
/home/green/bk/linux/drivers/staging/lustre/lustre/llite/symlink.c:123:8: note: ‘symname’ was declared here
  char *symname;
        ^

---
 drivers/staging/lustre/lustre/llite/symlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 80d48b5..129d302 100644
@@ -120,7 +120,7 @@ static void *ll_follow_link(struct dentry *dentry, struct nameidata *nd)
 	struct inode *inode = dentry->d_inode;
 	struct ptlrpc_request *request = NULL;
 	int rc;
-	char *symname;
+	char *symname = NULL;
 
 	CDEBUG(D_VFSTRACE, "VFS Op\n");
 	/* Limit the recursive symlink depth to 5 instead of default

1.8.5.3