mwifiex: don't return zero on failure paths in mwifiex_pcie_init()

If pci_iomap() fails in mwifiex_pcie_init(), it breaks off initialization,
deallocates all resources, but returns zero.
The patch adds -EIO as return value in this case.

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: NAlexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: NBing Zhao <bzhao@marvell.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/pcie.c

@@ -1985,6 +1985,7 @@ static int mwifiex_pcie_init(struct mwifiex_adapter *adapter)
 	card->pci_mmap = pci_iomap(pdev, 0, 0);
 	if (!card->pci_mmap) {
 		dev_err(adapter->dev, "iomap(0) error\n");
+		ret = -EIO;
 		goto err_iomap0;
 	}
 	ret = pci_request_region(pdev, 2, DRV_NAME);
@@ -1995,6 +1996,7 @@ static int mwifiex_pcie_init(struct mwifiex_adapter *adapter)
 	card->pci_mmap1 = pci_iomap(pdev, 2, 0);
 	if (!card->pci_mmap1) {
 		dev_err(adapter->dev, "iomap(2) error\n");
+		ret = -EIO;
 		goto err_iomap2;
 	}