[GFS2] Fix use of bitops on unsigned int (struct gfs2_holder->gh_iflags)

fs/gfs2/glock.c: In function ‘gfs2_holder_get’:
fs/gfs2/glock.c:439: warning: passing argument 2 of ‘set_bit’ from incompatible pointer type
fs/gfs2/glock.c: In function ‘rq_promote’:
fs/gfs2/glock.c:512: warning: passing argument 2 of ‘set_bit’ from incompatible pointer type
fs/gfs2/glock.c:526: warning: passing argument 2 of ‘set_bit’ from incompatible pointer type
 ...

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/gfs2/incore.h

@@ -157,7 +157,7 @@ struct gfs2_holder {
 	unsigned gh_flags;
 
 	int gh_error;
-	unsigned gh_iflags;
+	unsigned long gh_iflags;
 	struct completion gh_wait;
 	unsigned long gh_ip;
 };