udf: fix udf_debug macro

udf_debug should be enclosed with do { } while (0)
to be safely used in code like below:
if (something)
	udf_debug();
else
	anything;
(Otherwise compiler will not compile it with:
"error: expected expression before 'else'")

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/udf_fs.h b/include/linux/udf_fs.h
index 36c684e..c954527 100644 (file)
--- a/include/linux/udf_fs.h
+++ b/include/linux/udf_fs.h
@@ -39,11 +39,11 @@
 
 #ifdef UDFFS_DEBUG
 #define udf_debug(f, a...) \
-       { \
+       do { \
                printk (KERN_DEBUG "UDF-fs DEBUG %s:%d:%s: ", \
                        __FILE__, __LINE__, __FUNCTION__); \
                printk (f, ##a); \
-       }
+       } while (0)
 #else
 #define udf_debug(f, a...) /**/
 #endif