staging: rtl8192u: Replace function rtl8192_rx_enable()

Remove function rtl8192_rx_enable as all it does is call
rtl8192_rx_initiate.
Rename rtl8192_rx_initiate to rtl8192_rx_enable and change its type from
static to non-static to maintain compatibility with call sites of
rtl8192_rx_enable.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190701091552.12696-1-nishkadg.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/r8192U_core.c

@@ -713,7 +713,7 @@ static u32 get_rxpacket_shiftbytes_819xusb(struct ieee80211_rx_stats *pstats)
 		+ pstats->RxBufShift);
 }
 
-static void rtl8192_rx_initiate(struct net_device *dev)
+void rtl8192_rx_enable(struct net_device *dev)
 {
 	struct r8192_priv *priv = (struct r8192_priv *)ieee80211_priv(dev);
 	struct urb *entry;
@@ -808,12 +808,6 @@ void rtl8192_set_rxconf(struct net_device *dev)
 	write_nic_dword(dev, RCR, rxconf);
 }
 
-/* wait to be removed */
-void rtl8192_rx_enable(struct net_device *dev)
-{
-	rtl8192_rx_initiate(dev);
-}
-
 void rtl8192_rtx_disable(struct net_device *dev)
 {
 	u8 cmd;