usb: gadget: mbim: Do not return error 0 from read

Return 0 from mbim_read only as an indication
of reset command and cable disconnection.
For all failure cases return error code not equal 0.

CRs-Fixed: 429455
Change-Id: Ia921bf4cbda7647e6b04042943ed17759d8d9d9b
Signed-off-by: Anna Perel <aperel@codeaurora.org>
1 file changed