mips: asm/io.h: Add in <linux/bug.h>

As part of the bug.h / BUILD_BUG_* clean up, this file was missed.

Signed-off-by: Tom Rini <trini@konsulko.com>

arch/mips/include/asm/io.h

@@ -10,6 +10,7 @@
 #ifndef _ASM_IO_H
 #define _ASM_IO_H
 
+#include <linux/bug.h>
 #include <linux/compiler.h>
 #include <linux/types.h>