afp: Properly report range lock errors when writing to forks.
afp: Properly report range lock errors when writing to forks.

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