staging: rtl8192u: Using function name as string

Solves the following checkpatch.pl for a triggered function:
WARNING: Prefer using '"%s...", __func__' to using 'setKey',
this function's name, in a string
Signed-off-by: Camylla Goncalves Cantanheide <c.cantanheide@gmail.com>
Link: https://lore.kernel.org/r/20200317085130.21213-1-c.cantanheide@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/r8192U_core.c

@@ -4886,11 +4886,11 @@ void setKey(struct net_device *dev, u8 EntryNo, u8 KeyIndex, u16 KeyType,
 	u8 i;
 
 	if (EntryNo >= TOTAL_CAM_ENTRY)
-		RT_TRACE(COMP_ERR, "cam entry exceeds in setKey()\n");
+		RT_TRACE(COMP_ERR, "cam entry exceeds in %s\n", __func__);
 
 	RT_TRACE(COMP_SEC,
-		 "====>to setKey(), dev:%p, EntryNo:%d, KeyIndex:%d, KeyType:%d, MacAddr%pM\n",
-		 dev, EntryNo, KeyIndex, KeyType, MacAddr);
+		 "====>to %s, dev:%p, EntryNo:%d, KeyIndex:%d, KeyType:%d, MacAddr%pM\n",
+		 __func__, dev, EntryNo, KeyIndex, KeyType, MacAddr);
 
 	if (DefaultKey)
 		usConfig |= BIT(15) | (KeyType << 2);