staging: rtl8712: Remove cast on void pointer

The following Coccinelle script was used to detect this:
@r@
expression x;
void* e;
type T;
identifier f;
@@
(
  *((T *)e)
|
  ((T *)x)[...]
|
  ((T *)x)->f
|
- (T *)
  e
)
Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/rtl8712_cmd.c

@@ -317,7 +317,7 @@ int r8712_cmd_thread(void *context)
 	unsigned int cmdsz, wr_sz, *pcmdbuf;
 	struct tx_desc *pdesc;
 	void (*pcmd_callback)(struct _adapter *dev, struct cmd_obj *pcmd);
-	struct _adapter *padapter = (struct _adapter *)context;
+	struct _adapter *padapter = context;
 	struct	cmd_priv	*pcmdpriv = &(padapter->cmdpriv);
 
 	allow_signal(SIGTERM);