nfs: remove kfree() redundant null checks

smatch analysis:

fs/nfs/getroot.c:130 nfs_get_root() info: redundant null
 check on name calling kfree()

fs/nfs/unlink.c:272 nfs_async_unlink() info: redundant null
 check on devname_garbage calling kfree()

Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: linux-nfs@vger.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index 033803c..44efaa8 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -126,8 +126,7 @@
 	}
 	spin_unlock(&ret->d_lock);
 out:
-	if (name)
-		kfree(name);
+	kfree(name);
 	nfs_free_fattr(fsinfo.fattr);
 	return ret;
 }