[PATCH -next] jbd2: fix build when CONFIG_BUG is not enabled

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From: Randy Dunlap <rdunlap@xxxxxxxxxxxx>

Fix build error when CONFIG_BUG is not enabled:

fs/jbd2/transaction.c:1175:3: error: implicit declaration of function '__WARN'

by changing __WARN() to WARN_ON(), as suggested by
Arnaud Lacombe <lacombar@xxxxxxxxx>.

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Arnaud Lacombe <lacombar@xxxxxxxxx>
---

Same build error as reported on 31-AUG-2011 for
linux-next 20110830.

 fs/jbd2/transaction.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- next-2011-1011.orig/fs/jbd2/transaction.c
+++ next-2011-1011/fs/jbd2/transaction.c
@@ -27,6 +27,7 @@
 #include <linux/highmem.h>
 #include <linux/hrtimer.h>
 #include <linux/backing-dev.h>
+#include <linux/bug.h>
 #include <linux/module.h>
 
 static void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh);
@@ -1171,8 +1172,7 @@ out_unlock_bh:
 	jbd_unlock_bh_state(bh);
 out:
 	JBUFFER_TRACE(jh, "exit");
-	if (ret)
-		__WARN();	/* All errors are bugs, so dump the stack */
+	WARN_ON(ret);	/* All errors are bugs, so dump the stack */
 	return ret;
 }
 
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