BUG: headers with BUG/BUG_ON etc. need linux/bug.h

If a header file is making use of BUG, BUG_ON, BUILD_BUG_ON, or any
other BUG variant in a static inline (i.e. not in a #define) then
that header really should be including <linux/bug.h> and not just
expecting it to be implicitly present.

We can make this change risk-free, since if the files using these
headers didn't have exposure to linux/bug.h already, they would have
been causing compile failures/warnings.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/include/net/netns/generic.h b/include/net/netns/generic.h
index d55f434..0931618 100644
--- a/include/net/netns/generic.h
+++ b/include/net/netns/generic.h
@@ -5,6 +5,7 @@
 #ifndef __NET_GENERIC_H__
 #define __NET_GENERIC_H__
 
+#include <linux/bug.h>
 #include <linux/rcupdate.h>
 
 /*