[GFS2] Move BUG() back into the header file

In order to make the file and line number reporting work
correctly, this has been moved back into the header file.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/util.h b/fs/gfs2/util.h
index c9624c3..4532dba 100644
--- a/fs/gfs2/util.h
+++ b/fs/gfs2/util.h
@@ -30,6 +30,7 @@
 do { \
 	if (unlikely(!(assertion))) { \
 		gfs2_assert_i(sdp); \
+		BUG(); \
         } \
 } while (0)