[GFS2] Unlock page on prepare_write try lock failure

When the try lock of the glock failed in prepare_write we were
incorrectly exiting this function with the page still locked.
This was resulting in further I/O to this page hanging.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/ops_address.c

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 9ddf975..5e9653c 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -360,8 +360,10 @@
 	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|LM_FLAG_TRY_1CB, &ip->i_gh);
 	error = gfs2_glock_nq_atime(&ip->i_gh);
 	if (unlikely(error)) {
-		if (error == GLR_TRYFAILED)
+		if (error == GLR_TRYFAILED) {
+			unlock_page(page);
 			error = AOP_TRUNCATED_PAGE;
+		}
 		goto out_uninit;
 	}