Merge branch 'ab/plug-random-leaks'

Leakfix. * ab/plug-random-leaks: reflog: free() ref given to us by dwim_log() submodule--helper: fix small memory leaks clone: fix a memory leak of the "git_dir" variable grep: fix a "path_list" memory leak grep: use object_array_clear() in cmd_grep() grep: prefer "struct grep_opt" over its "void *" equivalent