wifi: brcm80211: fmac: Add error handling for brcmf_usb_dl_writeimage()

In the Linux kernel, the following vulnerability has been resolved:

wifi: brcm80211: fmac: Add error handling for brcmf_usb_dl_writeimage()

The function brcmf_usb_dl_writeimage() calls the function

brcmf_usb_dl_cmd() but dose not check its return value. The

'state.state' and the 'state.bytes' are uninitialized if the

function brcmf_usb_dl_cmd() fails. It is dangerous to use

uninitialized variables in the conditions.

Add error handling for brcmf_usb_dl_cmd() to jump to error

handling path if the brcmf_usb_dl_cmd() fails and the

'state.state' and the 'state.bytes' are uninitialized.

Improve the error message to report more detailed error

information.