[qt] Fix for ignoring function's val with 'warn_unused_result'
[qt] Fix for ignoring function's val with 'warn_unused_result'

darina/omim,mapsme/omim,milchakov/omim,milchakov/omim,mapsme/omim,milchakov/omim,darina/omim,mapsme/omim,mpimenov/omim,mpimenov/omim,mapsme/omim,mapsme/omim,darina/omim,mpimenov/omim,mapsme/omim,milchakov/omim,darina/omim,mpimenov/omim,darina/omim,milchakov/omim,mpimenov/omim,mapsme/omim,darina/omim,mpimenov/omim,mpimenov/omim,mapsme/omim,darina/omim,mpimenov/omim,mapsme/omim,mapsme/omim,milchakov/omim,mapsme/omim,milchakov/omim,milchakov/omim,milchakov/omim,milchakov/omim,darina/omim,mapsme/omim,milchakov/omim,darina/omim,darina/omim,mpimenov/omim,darina/omim,mpimenov/omim,darina/omim,milchakov/omim,milchakov/omim,mpimenov/omim,mpimenov/omim,mpimenov/omim,mapsme/omim,darina/omim