mwifiex: add PCIe function level reset support

Hello Amitkumar Karwar,

This is a semi-automatic email about new static checker warnings.

The patch 4c5dae59d2e9: "mwifiex: add PCIe function level reset support" from Jul 26, 2016, leads to the following Smatch complaint:

drivers/net/wireless/marvell/mwifiex/pcie.c:3098 mwifiex_pcie_down_dev()
warn: variable dereferenced before check 'card' (see line 3090)

drivers/net/wireless/marvell/mwifiex/pcie.c
3089 struct pcie_service_card *card = adapter->card;

  3090		const struct mwifiex_pcie_card_reg *reg = card->pcie.reg;
                                                          ^^^^^^^^^^^^^^

New dereference.

3091
3092 if (mwifiex_write_reg(adapter, reg->drv_rdy, 0x00000000))
3093 mwifiex_dbg(adapter, ERROR, "Failed to write driver not-ready signature\n");
3094
3095 adapter->seq_num = 0;
3096 adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_4K;
3097

  3098		if (card) {
                    ^^^^

New check is too late.

  3099			if (reg->sleep_cookie)
  3100				mwifiex_pcie_delete_sleep_cookie_buf(adapter);

regards,
dan carpenter