device-mapper: using EXPORT_SYBOL in dm-space-map-checker.c needs export.h

Reported-by: Witold Baryluk <[email protected]>
Signed-off-by: Stephen Rothwell <[email protected]>
Signed-off-by: Paul Gortmaker <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: sfrothwell

drivers/md/persistent-data/dm-space-map-checker.c

@@ -7,6 +7,7 @@
 #include "dm-space-map-checker.h"
 
 #include <linux/device-mapper.h>
+#include <linux/export.h>
 
 #ifdef CONFIG_DM_DEBUG_SPACE_MAPS