makepkg: deal with mercurial exit codes

From mercurial-2.1, "hg pull" returns 1 when there are no updates.
Catch the return code and either pull the update or return an
error as appropriate.

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/makepkg.sh.in

@@ -1730,8 +1730,13 @@ devel_check() {
 			msg "$(gettext "Determining latest %s revision...")" 'hg'
 			if [[ -d ./src/$_hgrepo ]] ; then
 				cd ./src/$_hgrepo
-				hg pull
-				hg update
+				local ret=0
+				hg pull || ret=$?
+				if (( ! ret )); then
+					hg update
+				elif (( ret != 1 )); then
+					return 1
+				fi
 			else
 				[[ ! -d ./src/ ]] && mkdir ./src/
 				hg clone $_hgroot/$_hgrepo ./src/$_hgrepo