mwifiex: Remove casts of pointer to same type

Casting a pointer to a pointer of the same type is pointless,
so remove these unnecessary casts.

Done via coccinelle script:

$ cat typecast_2.cocci
@@
type T;
T *foo;
@@

-	(T *)foo
+	foo

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
index 0e8ca7b..4e6e75c 100644
--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -1653,7 +1653,7 @@
 	curr_bcn_bytes -= ETH_ALEN;
 
 	if (!ext_scan) {
-		rssi = (s32) *(u8 *)current_ptr;
+		rssi = (s32) *current_ptr;
 		rssi = (-rssi) * 100;		/* Convert dBm to mBm */
 		current_ptr += sizeof(u8);
 		curr_bcn_bytes -= sizeof(u8);