idevicebackup2: Fix invalid check for password given on command line
idevicebackup2: Fix invalid check for password given on command line

libimobiledevice/libimobiledevice,libimobiledevice-win32/libimobiledevice,kalev/libimobiledevice,upbit/libimobiledevice,upbit/libimobiledevice,Tatsh/libimobiledevice,Tatsh/libimobiledevice,Tatsh/libimobiledevice,libimobiledevice-win32/libimobiledevice,libimobiledevice-win32/libimobiledevice,libimobiledevice-win32/libimobiledevice,kalev/libimobiledevice,kalev/libimobiledevice,libimobiledevice/libimobiledevice,upbit/libimobiledevice,patweb/libimobiledevice,patweb/libimobiledevice,patweb/libimobiledevice,Tatsh/libimobiledevice