staging: r8188eu: Use sizeof dereferenced pointer in kzalloc()

checkpatch.pl emits the following warning:

CHECK: Prefer kzalloc(sizeof(*pcmd)...) over kzalloc(sizeof(struct cmd_obj)...)
+       pcmd = kzalloc(sizeof(struct cmd_obj), GFP_KERNEL);

CHECK: Prefer kzalloc(sizeof(*psetkeyparm)...) over kzalloc(sizeof(struct setkey_parm)...)
+       psetkeyparm = kzalloc(sizeof(struct setkey_parm), GFP_KERNEL).

According to the above "CHECK[S]", use the preferred style in the two kzalloc()
of rtw_set_key().
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20220208180426.27455-2-fmdefrancesco@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_mlme.c

@@ -1600,12 +1600,12 @@ int rtw_set_key(struct adapter *adapter, struct security_priv *psecuritypriv, in
 	struct mlme_priv		*pmlmepriv = &adapter->mlmepriv;
 	int	res = _SUCCESS;
 
-	pcmd = kzalloc(sizeof(struct cmd_obj), GFP_KERNEL);
+	pcmd = kzalloc(sizeof(*pcmd), GFP_KERNEL);
 	if (!pcmd) {
 		res = _FAIL;  /* try again */
 		goto exit;
 	}
-	psetkeyparm = kzalloc(sizeof(struct setkey_parm), GFP_KERNEL);
+	psetkeyparm = kzalloc(sizeof(*psetkeyparm), GFP_KERNEL);
 	if (!psetkeyparm) {
 		kfree(pcmd);
 		res = _FAIL;