arm64 can have empty alternatives, which are effectively no-ops.  Ignore
them.

Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 tools/objtool/check.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 6e33a29bd3ed..7297fb87f876 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1994,10 +1994,8 @@ static int add_special_section_alts(struct objtool_file *file)
 		}
 
 		if (special_alt->group) {
-			if (!special_alt->orig_len) {
-				ERROR_INSN(orig_insn, "empty alternative entry");
+			if (!special_alt->orig_len)
 				continue;
-			}
 
 			if (handle_group_alt(file, special_alt, orig_insn, &new_insn))
 				return -1;
-- 
2.53.0