Comment 2 for bug 1152997

StacktraceTop:
 libusb_submit_transfer (transfer=transfer@entry=0x7fba24024858) at ../../libusb/io.c:1290
 do_sync_bulk_transfer (dev_handle=0x7fba240271f0, endpoint=<optimized out>, buffer=buffer@entry=0x7fba2400f6b0 "\f", length=<optimized out>, transferred=transferred@entry=0x7fba322d37a4, timeout=<optimized out>, type=type@entry=2 '\002') at ../../libusb/sync.c:175
 libusb_bulk_transfer (dev_handle=<optimized out>, endpoint=<optimized out>, data=data@entry=0x7fba2400f6b0 "\f", length=<optimized out>, transferred=transferred@entry=0x7fba322d37a4, timeout=<optimized out>) at ../../libusb/sync.c:270
 ptp_write_func (size=size@entry=12, data=0x7fba2400f580, written=written@entry=0x7fba322d3808, handler=0x7fba322d3810, handler=0x7fba322d3810) at libusb1-glue.c:975
 ptp_usb_sendreq (params=0x7fba24007070, req=0x7fba322d3c40) at libusb1-glue.c:1165