device-mapper: dm-bufio.c needs to include module.h

since it uses the module facilities.
Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/md/dm-bufio.c

@@ -14,6 +14,7 @@
 #include <linux/vmalloc.h>
 #include <linux/version.h>
 #include <linux/shrinker.h>
+#include <linux/module.h>
 
 #define DM_MSG_PREFIX "bufio"