git: cd1e479361bf - stable/15 - amd/int0x80 test: fix inline asm for gcc

The branch stable/15 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=cd1e479361bf3919019f27f28a4314449b30c764

commit cd1e479361bf3919019f27f28a4314449b30c764
Author:     Ryan Libby <rlibby@FreeBSD.org>
AuthorDate: 2026-05-04 16:34:41 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-05-14 00:48:03 +0000

    amd/int0x80 test: fix inline asm for gcc
    
    (cherry picked from commit d5728351a58b87764f3302eb8c4ca9f35e99e8b6)
---
 tests/sys/arch/amd64/int0x80.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tests/sys/arch/amd64/int0x80.c b/tests/sys/arch/amd64/int0x80.c
index e03462a6dccd..fbe98fb341a1 100644
--- a/tests/sys/arch/amd64/int0x80.c
+++ b/tests/sys/arch/amd64/int0x80.c
@@ -46,12 +46,13 @@ fire(void)
 {
 	int res;
 
+	res = SYS_getpid;
 	asm volatile(
 	    ".globl\tafter_int0x80\n"
 	    "\tint\t$0x80\n"
 	    "after_int0x80:"
-	    : "=a" (res)
-	    : "%0" (SYS_getpid)
+	    : "+a" (res)
+	    :
 	    : "rdx", "memory", "cc");
 	return (res);
 }