Index: utils/docker/build_docker_image.sh
===================================================================
--- utils/docker/build_docker_image.sh
+++ utils/docker/build_docker_image.sh
@@ -15,7 +15,7 @@
 BUILDSCRIPT_ARGS=""
 
 function show_usage() {
-  usage=$(cat << EOF
+  cat << EOF
 Usage: build_docker_image.sh [options] [-- [cmake_args]...]
 
 Available options:
@@ -64,8 +64,6 @@
     -DCLANG_ENABLE_BOOTSTRAP=ON \ 
     -DCLANG_BOOTSTRAP_TARGETS="install-clang;install-clang-headers"
 EOF
-)
-  echo "$usage"
 }
 
 SEEN_INSTALL_TARGET=0