Remove temporary files in clang-format script

diff --git a/dist/s_clang-format b/dist/s_clang-format

index 58e4b59f0..ee7fc9475 100755

--- a/dist/s_clang-format

+++ b/dist/s_clang-format

@@ -2,6 +2,11 @@

 set -o pipefail

+t=__wt.$$

+trap 'rm -rf $t' 0 1 2 3 13 15

+

+echo "check for $t"

+

 download_clang_format() {

        if [ `uname` = "Linux" ]; then

                curl https://s3.amazonaws.com/boxes.10gen.com/build/clang-format-3.8-rhel55.tar.gz -o dist/clang-format.tar.gz

@@ -45,16 +50,15 @@ esac

 # Don't format inplace with -i flag.

 # We want to be able to detect modifications.

 for f in $search; do

-       tempfile=$(mktemp)

        cat "$f" | \

             clang-format --fallback-style=none | \

             python dist/s_goto.py | \

-            python dist/s_comment.py > "$tempfile" || exit 1

-       cmp --silent "$f" "$tempfile"

+            python dist/s_comment.py > "$t" || exit 1

+       cmp --silent "$f" "$t"

        if test $? -ne 0; then

                if test $# -eq 0 ; then

                        echo "Modifying $f"

                fi

-               mv "$tempfile" "$f"

+               cp "$t" "$f"

        fi

 done