Otherwise GCC produces the following warnings as the stub
__get_cpuid() is defined as '#define __get_cpuid(...) 0':

x86-common.c: In function 'register_x86_crypto':
x86-common.c:314:15: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
  314 |  family = ((a >> 8) & 0x0F);
      |            ~~~^~~~~
x86-common.c:308:15: note: 'a' was declared here
  308 |  unsigned int a,b,c,d;
      |               ^

Signed-off-by: Daiki Ueno <ueno@gnu.org>