[PATCH] um: irq changes break build

Fixup broken UML build due to 7d12e780e003f93433d49ce78cfedf4b4c52adc5
"IRQ: Maintain regs pointer globally rather than passing to IRQ handlers".

Cc: David Howells <[e-mail]>
Cc: Jeff Dike <[e-mail]>
Cc: Paolo "Blaisorblade" Giarrusso <[e-mail]>
Signed-off-by: Pekka Enberg <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/um/kernel/irq.c

···
 unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
 {
        irq_enter();
-       __do_IRQ(irq, (struct pt_regs *)regs);
+       __do_IRQ(irq);
        irq_exit();
        return 1;
 }

include/asm-um/irq_regs.h

···
+#include <asm-generic/irq_regs.h>