gfs2: remove redundant set of INSTANTIATE_NEEDED

Function rgrp_go_inval calls gfs2_rgrp_brelse to invalidate the
in-core rgrp structures. After the call it set GLF_INSTANTIATE_NEEDED,
which is redundant, since gfs2_rgrp_brelse also sets it.
This patch simply removes the redundant set_bit.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/glops.c

@@ -228,7 +228,6 @@ static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 	gfs2_rgrp_brelse(rgd);
 	WARN_ON_ONCE(!(flags & DIO_METADATA));
 	truncate_inode_pages_range(mapping, start, end);
-	set_bit(GLF_INSTANTIATE_NEEDED, &gl->gl_flags);
 }
 
 static void gfs2_rgrp_go_dump(struct seq_file *seq, struct gfs2_glock *gl,