gfs2: Fix unused value warning in do_gfs2_set_flags()

Coverity complains of an unused value:

CID 119623 (#1 of 1): Unused value (UNUSED_VALUE)
assigned_value: Assigning value -1 to error here, but that stored value is
overwritten before it can be used.
237        error = -EPERM;

Fix it by removing the assignment.
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/file.c

@@ -234,7 +234,6 @@ static int do_gfs2_set_flags(struct inode *inode, u32 reqflags, u32 mask)
 	if ((new_flags ^ flags) == 0)
 		goto out;
 
-	error = -EPERM;
 	if (!IS_IMMUTABLE(inode)) {
 		error = gfs2_permission(&init_user_ns, inode, MAY_WRITE);
 		if (error)