x86, amd, microcode: Fix error path in apply_microcode_amd()

Return -1 (like Intels apply_microcode) when the loading fails, also
do not set the active microcode level on failure.
Signed-off-by: Torsten Kaiser <just.for.lkml@googlemail.com>
Link: http://lkml.kernel.org/r/20130723225823.2e4e7588@googlemail.comAcked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/kernel/microcode_amd.c

@@ -220,10 +220,11 @@ int apply_microcode_amd(int cpu)
 		return 0;
 	}
 
-	if (__apply_microcode_amd(mc_amd))
+	if (__apply_microcode_amd(mc_amd)) {
 		pr_err("CPU%d: update failed for patch_level=0x%08x\n",
 			cpu, mc_amd->hdr.patch_id);
-	else
+		return -1;
+	}
 	pr_info("CPU%d: new patch_level=0x%08x\n", cpu,
 		mc_amd->hdr.patch_id);