genirq: Export handle_bad_irq

genirq: Export handle_bad_irq

A cleanup of the omap gpio driver introduced a use of the
handle_bad_irq() function in a device driver that can be
a loadable module.

This broke the ARM allmodconfig build:

ERROR: "handle_bad_irq" [drivers/gpio/gpio-omap.ko] undefined!

This patch exports the handle_bad_irq symbol in order to
allow the use in modules.

Signed-off-by: Arnd Bergmann <[email protected]>
Cc: Grygorii Strashko <[email protected]>
Cc: Santosh Shilimkar <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Austin Schuh <[email protected]>
Cc: Tony Lindgren <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/5847725.4IBopItaOr@wuerfel
Signed-off-by: Thomas Gleixner <[email protected]>