[RFC] Add missing #include <linux/bug.h>

[Eric Engestrom]

ARRAY_SIZE uses BUILD_BUG_ON_ZERO, which is undefined is you don't
include linux/bug.h first, which just happened to me.

Is there any reason this include isn't here? A quick grep found 595
other files using a define from bug.h without ever including it.

If this is a simple mistake and was forgotten, I can send an actual
patchset to fix this, but it feels like it was left out on purpose.

Cheers,
  Eric Engestrom

PS: If this is a cleanup that needs to be done, I might to it for other
headers as well.

---
 include/linux/compiler-gcc.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index eeae401..01e6869 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -2,6 +2,8 @@
 #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
 #endif
 
+#include <linux/bug.h>
+
 /*
  * Common definitions for all gcc versions go here.
  */
-- 
2.8.1