mwifiex: rename function mwifiex_is_ba_stream_avail

The old function name sounds like checking for existing BA
stream. The function actually checks if we have room for
creating new BA stream or not.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index 57b98c5..99e8431 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -1186,7 +1186,7 @@
 		   mwifiex_send_single_packet() */
 	} else {
 		if (mwifiex_is_ampdu_allowed(priv, tid)) {
-			if (mwifiex_is_ba_stream_avail(adapter)) {
+			if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
 				mwifiex_11n_create_tx_ba_stream_tbl(priv,
 						ptr->ra, tid,
 						BA_STREAM_SETUP_INPROGRESS);