Fix misleading usage of return type of Open*Log
Fix misleading usage of return type of Open*Log

In an earlier version of 791c887e22046e5e7a2d05ecb5ff27701d56895d those
functions returned LoadStatus, too, but it was changed back to bool.

Qix-/ninja,sgraham/ninja,AoD314/ninja,ninja-build/ninja,sgraham/ninja,sgraham/ninja,iwadon/ninja,Qix-/ninja,maruel/ninja,ninja-build/ninja,maruel/ninja,maruel/ninja,iwadon/ninja,bradking/ninja,bradking/ninja,ninja-build/ninja,iwadon/ninja,maruel/ninja,ninja-build/ninja,Qix-/ninja,sgraham/ninja,bradking/ninja,AoD314/ninja,AoD314/ninja,iwadon/ninja,Qix-/ninja,bradking/ninja,AoD314/ninja