GVfsJobError: Return TRUE in try
GVfsJobError: Return TRUE in try

This fixes a warning and a potentially useless call of do() method in
a thread.

xkahn/gvfs-cmis,halfline/gvfs,gicmo/gvfs,gicmo/gvfs,gicmo/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,xkahn/gvfs-cmis,halfline/gvfs,xkahn/gvfs-cmis,halfline/gvfs