mwifiex: fix issues in driver unload path for USB chipsets
1) After driver load failure, clear 'card->adapter' instead of card pointer so that card specific cleanup is performed later when user unloads the driver. 2) Clear usb_card pointer in disconnect handler to avoid invalid memory access when user unloads the driver after removing the card. Signed-off-by: NUjjal Roy <royujjal@gmail.com> Signed-off-by: NAmitkumar Karwar <akarwar@marvell.com> Signed-off-by: NBing Zhao <bzhao@marvell.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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