Use local labels in padlock.c

Fixes #3451

Signed-off-by: okhowang(王沛文) <okhowang@tencent.com>
diff --git a/library/padlock.c b/library/padlock.c
index 887a386..96463b9 100644
--- a/library/padlock.c
+++ b/library/padlock.c
@@ -54,10 +54,10 @@
              "cpuid                     \n\t"
              "cmpl  $0xC0000001, %%eax  \n\t"
              "movl  $0, %%edx           \n\t"
-             "jb    unsupported         \n\t"
+             "jb    1f                  \n\t"
              "movl  $0xC0000001, %%eax  \n\t"
              "cpuid                     \n\t"
-             "unsupported:              \n\t"
+             "1:                        \n\t"
              "movl  %%edx, %1           \n\t"
              "movl  %2, %%ebx           \n\t"
              : "=m" (ebx), "=m" (edx)