NFSv4: Fix memory leak in nfs4_set_security_label

We leak nfs_fattr and nfs4_label every time we set a security xattr.
Signed-off-by: Dmitry Mastykin <mastichi@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs4proc.c

@@ -6268,6 +6268,7 @@ nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
 	if (status == 0)
 		nfs_setsecurity(inode, fattr);
 
+	nfs_free_fattr(fattr);
 	return status;
 }
 #endif	/* CONFIG_NFS_V4_SECURITY_LABEL */