install-check-clang-version.sh: Export DEBIAN_FRONTEND instead of prefixing to apt-get

This makes reading the commands a little easier.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Author: nathanchance

distro-clang/install-check-clang-version.sh

@@ -6,9 +6,11 @@ set -x
 
 # Debian/Ubuntu
 if command -v apt-get &>/dev/null; then
+    export DEBIAN_FRONTEND=noninteractive
+
     apt-get update
-    DEBIAN_FRONTEND=noninteractive apt-get upgrade -y
-    DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y clang
+    apt-get upgrade -y
+    apt-get install --no-install-recommends -y clang
 # Fedora
 elif command -v dnf &>/dev/null; then
     dnf update -y