devtools: fix mailmap check for parentheses

When checking names having parentheses, the grep matching was failing.
It is fixed by escaping the open parenthesis.

Also, the mailmap path was relative to the root directory.
The path is made absolute.

Fixes: e83d41f ("mailmap: add list of contributors")
Fixes: 83812de ("devtools: move mailmap check after patch applied")
Cc: stable@dpdk.org

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>

devtools/check-git-log.sh

@@ -264,8 +264,10 @@ names=$(git log --format='From: %an <%ae>%n%b' --reverse $range |
 	sed -rn 's,.*: (.*<.*@.*>),\1,p' |
 	sort -u)
 bad=$(for contributor in $names ; do
+	contributor=${contributor//(/\\(}
 	! grep -qE "^$contributor($| <)" $selfdir/../.mailmap || continue
-	if grep -q "^${contributor%% <*} <" .mailmap ; then
+	name=${contributor%% <*}
+	if grep -q "^$name <" $selfdir/../.mailmap ; then
 		printf "\t$contributor is not the primary email address\n"
 	else
 		printf "\t$contributor is unknown in .mailmap\n"