staging: ath6kl: Cast variable to size_t to avoid compile warning

The min() macro does strict type-checking so use min_t() instead
to silence a compile warning.

Cc: Naveen Singh <naveen.singh@atheros.com>
Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsconfig.c

@@ -360,7 +360,7 @@ int PSSendOps(void *arg)
         	status = 1;
         	goto complete;
     	}
-	len = min(firmware->size, MAX_BDADDR_FORMAT_LENGTH - 1);
+	len = min_t(size_t, firmware->size, MAX_BDADDR_FORMAT_LENGTH - 1);
 	memcpy(config_bdaddr, firmware->data, len);
 	config_bdaddr[len] = '\0';
 	write_bdaddr(hdev,config_bdaddr,BDADDR_TYPE_STRING);