K 10
svn:author
V 5
dougm
K 8
svn:date
V 27
2020-05-30T01:48:12.054753Z
K 7
svn:log
V 602
RB_REMOVE invokes RB_REMOVE_COLOR either when child is red or child is
null. In the first case, RB_REMOVE_COLOR just changes the child to
black and returns. With this change, RB_REMOVE handles that case, and
drops the child argument to RB_REMOVE_COLOR, since that value is
always null.

RB_REMOVE_COLOR is changed to remove a couple of unneeded tests, and
to eliminate some deep indentation.

RB_ISRED is defined to combine a null check with a test for redness,
to replace that combination in several places.

Reviewed by:	markj
Tested by:	pho
Differential Revision:	https://reviews.freebsd.org/D25032

END