ia64: annotate switch fallthroughs in ia64_handle_unaligned

Replace the "no break" comments with something that the compiler
recognizes.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190812065524.19959-3-hch@lst.deSigned-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/kernel/unaligned.c

@@ -1431,7 +1431,7 @@ ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs)
 		if (u.insn.x)
 			/* oops, really a semaphore op (cmpxchg, etc) */
 			goto failure;
-		/* no break */
+		/*FALLTHRU*/
 	      case LDS_IMM_OP:
 	      case LDSA_IMM_OP:
 	      case LDFS_OP:
@@ -1459,7 +1459,7 @@ ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs)
 		if (u.insn.x)
 			/* oops, really a semaphore op (cmpxchg, etc) */
 			goto failure;
-		/* no break */
+		/*FALLTHRU*/
 	      case LD_IMM_OP:
 	      case LDA_IMM_OP:
 	      case LDBIAS_IMM_OP:
@@ -1475,7 +1475,7 @@ ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs)
 		if (u.insn.x)
 			/* oops, really a semaphore op (cmpxchg, etc) */
 			goto failure;
-		/* no break */
+		/*FALLTHRU*/
 	      case ST_IMM_OP:
 	      case STREL_IMM_OP:
 		ret = emulate_store_int(ifa, u.insn, regs);