Fail the script if duplicate deps found

Author: nyonson

ci/run_task.sh

@@ -298,7 +298,7 @@ do_dup_deps() {
 
     if [ "$duplicate_dependencies" -ne 0 ]; then
         cargo tree  --target=all --all-features --duplicates
-        say_err "Dependency tree is broken, contains duplicates"
+        err "Dependency tree is broken, contains duplicates"
     fi
 
     set -o pipefail
@@ -345,10 +345,6 @@ say() {
     echo "run_task: $1"
 }
 
-say_err() {
-    say "$1" >&2
-}
-
 verbose_say() {
     case "${MAINTAINER_TOOLS_LOG_LEVEL:-verbose}" in
         quiet)