[GFS2] The case of the missing asterisk

A dereference was forgotten. This adds it back correctly.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 1fda731..7f72564 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -402,7 +402,7 @@
 
 	for (x = 0; x < end_of_metadata; x++) {
 		lookup_block(ip, x, mp, create, new, dblock);
-		if (!dblock)
+		if (!*dblock)
 			return 0;
 
 		ret = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &mp->mp_bh[x+1]);