ejweber: Don't attempt to detach an FC device if we don't know its name

JobBuild
94781
09-15 12:58
5cd63097
09-15 12:57
pull-kubernetes-bazel-build 1308505382833885184 1305853160262209537
pull-kubernetes-bazel-test 1308555101408858112 1308505382850662400 1305853160274792450
pull-kubernetes-conformance-kind-ga-only-parallel 1308505382963908608 1305853160274792449
pull-kubernetes-dependencies 1308505382871633920 1305853160266403840
pull-kubernetes-e2e-gce-100-performance 1308505382997463040 1305853160262209536
pull-kubernetes-e2e-gce-csi-serial 1306013628327006208 1305948035737456640 1305880717464440835 1305853160274792455
pull-kubernetes-e2e-gce-storage-slow 1305853160266403843
pull-kubernetes-e2e-gce-storage-slow-rbe 1308555101454995456 1306013628327006209 1305948035737456641 1305908525515411456 1305880717464440834 1305853160274792452
pull-kubernetes-e2e-gce-storage-snapshot 1305908525515411457 1305853160258015233
pull-kubernetes-e2e-gce-ubuntu-containerd 1308505382892605440 1305853160258015232
pull-kubernetes-e2e-kind 1308505382926159872 1305853160266403841
pull-kubernetes-e2e-kind-ipv6 1308555101434023936 1308505382947131392 1305853160274792451
pull-kubernetes-integration 1308505382909382656 1305853160266403842
pull-kubernetes-node-e2e 1308505382976491520 1305853160274792448
pull-kubernetes-typecheck 1308505383668551680 1305853160274792453
pull-kubernetes-verify 1308505384511606784 1305853160274792454