libusb.c: More "gphoto2-port-usb"->"libusb" fixes
libusb.c: More "gphoto2-port-usb"->"libusb" fixes

This fixes the component in the gp_log(GP_LOG_*,...)
calls which were forgotten last time.


git-svn-id: 40dd595c6684d839db675001a64203a1457e7319@12684 67ed7778-7388-44ab-90cf-0a291f65f57c

gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION,gphoto/libgphoto2.OLDMIGRATION