rt2x00: rt2x00lib: use rt2x00_has_cap_* helpers

Use the appropriate helper functions instead of
directly accessing the rt2x00dev->cap_flags field
to check device capability flags.

This improves readability of the code a bit.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index 218e320..50590b1 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -61,7 +61,7 @@
 	 * at least 8 bytes bytes available in headroom for IV/EIV
 	 * and 8 bytes for ICV data as tailroon.
 	 */
-	if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags)) {
+	if (rt2x00_has_cap_hw_crypto(rt2x00dev)) {
 		head_size += 8;
 		tail_size += 8;
 	}