Comment 4 for bug 1295779

Description of problem:
Scanned, turned scanner off and on, scanned again -- got crash

Version-Release number of selected component:
simple-scan-3.10.2-1.fc20

Additional info:
reporter: libreport-2.2.0
backtrace_rating: 4
cmdline: simple-scan
crash_function: libusb_clear_halt
executable: /usr/bin/simple-scan
kernel: 3.13.6-200.fc20.x86_64
runlevel: N 5
type: CCpp
uid: 1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 libusb_clear_halt at core.c:1584
 #1 sanei_usb_clear_halt at sanei_usb.c:2203
 #2 usb_dev_close at xerox_mfp-usb.c:95
 #3 sane_dll_close at dll.c:1223
 #4 sane_close at dll-s.c:78
 #5 scanner_close_device at /home/bob/bzr/simple-scan/3.10/src/scanner.vala:766
 #6 scanner_fail_scan at /home/bob/bzr/simple-scan/3.10/src/scanner.vala:780
 #7 scanner_do_get_parameters at /home/bob/bzr/simple-scan/3.10/src/scanner.vala:1230
 #8 scanner_scan_thread at /home/bob/bzr/simple-scan/3.10/src/scanner.vala:1481
 #9 _scanner_scan_thread_gthread_func at scanner.c:12474