Merge branch 'jk/format-patch-leakfix' into next

A memory leak in the '--base' handling of 'git format-patch' has been plugged, and the leak-reporting of the test suite when running under a TAP harness has been improved. * jk/format-patch-leakfix: format-patch: fix leak of rev_info in prepare_bases() t: move LSan errors from stdout to stderr