Fixes warnings in the workspace

Change-Id: Ib6a991201af2fc17353024698f22e247c799bf41
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ui/+/186337
Tested-by: Platform Bot <platform-bot@eclipse.org>