xfs: fix a missing unlock in xfs_growfs_data

The newly added check for the internal RT device needs to unlock
m_growlock just like all ther other error cases.

Fixes: bdc03eb ("xfs: allow internal RT devices for zoned mode")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: Christoph Hellwig

fs/xfs/xfs_fsops.c

@@ -301,16 +301,18 @@ xfs_growfs_data(
 	struct xfs_mount	*mp,
 	struct xfs_growfs_data	*in)
 {
-	int			error = 0;
+	int			error;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 	if (!mutex_trylock(&mp->m_growlock))
 		return -EWOULDBLOCK;
 
 	/* we can't grow the data section when an internal RT section exists */
-	if (in->newblocks != mp->m_sb.sb_dblocks && mp->m_sb.sb_rtstart)
-		return -EINVAL;
+	if (in->newblocks != mp->m_sb.sb_dblocks && mp->m_sb.sb_rtstart) {
+		error = -EINVAL;
+		goto out_error;
+	}
 
 	/* update imaxpct separately to the physical grow of the filesystem */
 	if (in->imaxpct != mp->m_sb.sb_imax_pct) {