MTP: Review feedback: Use g_vfs_job_failed_literal.
MTP: Review feedback: Use g_vfs_job_failed_literal.

Used in all appropriate locations.

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