ia64: annotate a switch fallthrough in ia64_do_signal

Also reindent the switch statement to use the normal kernel style
while at it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190812065524.19959-2-hch@lst.deSigned-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/signal.c

@@ -368,13 +368,13 @@ ia64_do_signal (struct sigscratch *scr, long in_syscall)
 				scr->pt.r8 = EINTR;
 				/* note: scr->pt.r10 is already -1 */
 				break;
-
 			case ERESTARTSYS:
 				if ((ksig.ka.sa.sa_flags & SA_RESTART) == 0) {
 					scr->pt.r8 = EINTR;
 					/* note: scr->pt.r10 is already -1 */
 					break;
 				}
+				/*FALLTHRU*/
 			case ERESTARTNOINTR:
 				ia64_decrement_ip(&scr->pt);
 				restart = 0; /* don't restart twice if handle_signal() fails... */