powerpc/powernv: Mark function as __noreturn

There is a mismatch between function pnv_platform_error_reboot() definition
and declaration regarding function modifiers. In the declaration part, it
contains the function attribute __noreturn, while function definition
itself lacks it.

This was reported by sparse tool as an error:

arch/powerpc/platforms/powernv/opal.c:538:6: error: symbol 'pnv_platform_error_reboot' redeclared with different type (originally declared at arch/powerpc/platforms/powernv/powernv.h:11) - different modifiers

I checked and the function is already being considered as being 'noreturn'
by the compiler, thus, I understand this patch does not change any code
being generated.

Signed-off-by: Breno Leitao <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/platforms/powernv/opal.c

···
 	return recovered;
 }
 
-void pnv_platform_error_reboot(struct pt_regs *regs, const char *msg)
+void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg)
 {
 	panic_flush_kmsg_start();