Staging: rtl8723bs: Replace NULL comparison with !

Replace NULL comparison with ! in function rtw_init_cmd_priv, to
maintain Linux kernel coding style.
Signed-off-by: Madhumitha Prabakaran <madhumithabiw@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_cmd.c

@@ -177,7 +177,7 @@ int rtw_init_cmd_priv(struct	cmd_priv *pcmdpriv)
 
 	pcmdpriv->cmd_allocated_buf = rtw_zmalloc(MAX_CMDSZ + CMDBUFF_ALIGN_SZ);
 
-	if (pcmdpriv->cmd_allocated_buf == NULL) {
+	if (!pcmdpriv->cmd_allocated_buf) {
 		res = -ENOMEM;
 		goto exit;
 	}
@@ -186,7 +186,7 @@ int rtw_init_cmd_priv(struct	cmd_priv *pcmdpriv)
 
 	pcmdpriv->rsp_allocated_buf = rtw_zmalloc(MAX_RSPSZ + 4);
 
-	if (pcmdpriv->rsp_allocated_buf == NULL) {
+	if (!pcmdpriv->rsp_allocated_buf) {
 		res = -ENOMEM;
 		goto exit;
 	}