powerpc/traps: remove redundant in_interrupt panic in die()

do_exit() already includes a test to panic() is in_interrupt()

This patch removes powerpc one which is redundant.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/traps.c

@@ -247,8 +247,6 @@ static void oops_end(unsigned long flags, struct pt_regs *regs,
 		mdelay(MSEC_PER_SEC);
 	}
 
-	if (in_interrupt())
-		panic("Fatal exception in interrupt");
 	if (panic_on_oops)
 		panic("Fatal exception");
 	do_exit(signr);