x86/mce: Remove redundant check from mce_device_create()

mce_device_create() is called only from mce_cpu_online() which in turn
will be called iff MCA support is available. That is, at the time of
mce_device_create() call it's guaranteed that MCA support is available.
No need to duplicate this check so remove it.

  [ bp: Massage commit message. ]
Signed-off-by: Nikolay Borisov <nik.borisov@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231107165529.407349-1-nik.borisov@suse.com

arch/x86/kernel/cpu/mce/core.c

@@ -2584,9 +2584,6 @@ static int mce_device_create(unsigned int cpu)
 	int err;
 	int i, j;
 
-	if (!mce_available(&boot_cpu_data))
-		return -EIO;
-
 	dev = per_cpu(mce_device, cpu);
 	if (dev)
 		return 0;