lib/string.h build failure in linux-next

I'm seeing a build failure in lib/string.h in linux-next:

/es/linux/linux-next/lib/string.c: In function 'strlcat':
/es/linux/linux-next/lib/string.c:225:2: error: implicit declaration of function 'printk'
/es/linux/linux-next/lib/string.c:225:2: error: implicit declaration of function 'panic'

Commit e2950c2b6ecb928bfd3a13dd237df1f29f712704 removed an include of
linux/module.h which triggered the problem for arch/c6x and probably
other architectures using the asm-generic BUG macro.

I think this needs fixing in asm-generic/bug.h which should include
linux/kernel.h for panic and linux/printk.h for printk.

--Mark