[exp] Fix script

bin/mc-2/exp

@@ -128,15 +128,12 @@ dump_system() {
 dump_versions() {
     msg "# Dumping versions"
 
+    local git="git -C $BENCH_PATH"
     local version_dir=$RESULTS_DIR/version
     mkdir -p $version_dir
 
-    git -C $BENCH_PATH rev-parse HEAD         >>$version_dir/bench-hash      2>/dev/null
-    git submodule foreach git rev-parse HEAD  >>$version_dir/submodules-hash 2>/dev/null
-
-    git -C $BENCH_PATH diff HEAD              >>$version_dir/bench-diff      2>/dev/null
-    git submodule foreach git diff HEAD       >>$version_dir/submodules-diff 2>/dev/null
-
+    $git rev-parse HEAD                        >>$version_dir/bench-hash      2>/dev/null
+    $git submodule foreach git rev-parse HEAD  >>$version_dir/submodules-hash 2>/dev/null
 }
 
 dump_args() {