staging: r8188eu: handle rtw_init_netdev_name() failure appropriately

rtw_init_netdev_name() calls dev_alloc_name() which allocates the name
for the device as per the given name format.
The name format is specified by the module parameter "ifname".
It returns a negative err code if the format is invalid. Handle this
error appropriately.
Cancel the timers ininitliazed by rtw_init_drv_sw() before calling
rtw_free_drv_sw() and then proceed to free the adapter.

Also, if register_netdev() fails then goto free_drv_sw instead of
goto handle_dualmac.

Reviewed-by: Dan Carpenter <[email protected]>
Signed-off-by: Vihas Mak <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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