Merge branch 'pw/diff-color-moved-ws-fix'

Various fixes to "diff --color-moved-ws".

* pw/diff-color-moved-ws-fix:
diff --color-moved: fix a memory leak
diff --color-moved-ws: fix another memory leak
diff --color-moved-ws: fix a memory leak
diff --color-moved-ws: fix out of bounds string access
diff --color-moved-ws: fix double free crash

diff --cc diff.c
Simple merge