cpucontrol: fix extended signature matching code to avoid fallthough

PR:		256502
MFC after:	1 week

usr.sbin/cpucontrol/intel.c

@@ -242,8 +242,8 @@ intel_update(const struct ucode_update_params *params)
 			    (flags & ext_table[i].cpu_flags) != 0)
 				goto matched;
 		}
-	} else
-		goto fail;
+	}
+	goto fail;
 
 matched:
 	if (revision >= fw_header->revision) {