fw_req: fix invalid assignment of errno to GError
fw_req: fix invalid assignment of errno to GError

The call of hinawa_fw_node_ioctl() assigns negative value to given pointer
for error code. Although the code in GError should be positive value,
the negative value is assigned to the code as is.

This commit fixes the bug.

Fixes: 3bb14b88d1ed ("fw_req: solve suprious wakeup in conditional wakeup of threading implementation")
Signed-off-by: Takashi Sakamoto <d5ec7d0cd8074757a1f5eb708bc105c3065a65ea@sakamocchi.jp>

takaswie/libhinawa,takaswie/libhinawa