xfs: Initialize error in xfs_attr_remove_iter

A recent bug report generated a warning that a code path in
xfs_attr_remove_iter could potentially return error uninitialized in the
case of XFS_DAS_RM_SHRINK state.  Fix this by initializing error.
Signed-off-by: NAllison Henderson <allison.henderson@oracle.com>
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NBrian Foster <bfoster@redhat.com>
Reviewed-by: NBill O'Donnell <bodonnel@redhat.com>
Reviewed-by: NDarrick J. Wong <djwong@kernel.org>
Signed-off-by: NDarrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_attr.c

@@ -1375,7 +1375,7 @@ xfs_attr_remove_iter(
 {
 	struct xfs_da_args		*args = dac->da_args;
 	struct xfs_da_state		*state = dac->da_state;
-	int				retval, error;
+	int				retval, error = 0;
 	struct xfs_inode		*dp = args->dp;
 
 	trace_xfs_attr_node_removename(args);