cache-tree tests: use a sub-shell with less indirection
Change a "cd xyz && work && cd .." pattern introduced in 9c4d6c0297 (cache-tree: Write updated cache-tree after commit, 2014-07-13) to use a sub-shell instead with less indirection. We did actually recover correctly if we failed in this function since we were wrapped in a subshell one function call up. Let's just use the sub-shell at the point where we want to change the directory instead. It's important that the "|| return 1" is outside the subshell. Normally, we `exit 1` from within subshells[1], but that wouldn't help us exit this loop early[1][2]. Since we can get rid of the wrapper function let's rename the main function to drop the "rec" (for "recursion") suffix[3]. 1. https://lore.kernel.org/git/CAPig+cToj8nQmyBCqC1k7DXF2vXaonCEA-fCJ4x7JBZG2ixYBw@mail.gmail.com/ 2. https://lore.kernel.org/git/20150325052952.GE31924@peff.net/ 3. https://lore.kernel.org/git/YARsCsgXuiXr4uFX@coredump.intra.peff.net/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>