internal/buildscripts: fix for shellcheck SC2086

Author: dnaeon

internal/buildscripts/compare-apidiff.sh

@@ -19,7 +19,7 @@ input_dir="./internal/data/apidiff"
 check_only=false
 repo_toplevel="$( git rev-parse --show-toplevel )"
 tools_mod_file="${repo_toplevel}/internal/tools/go.mod"
-apidiff_cmd="$( go tool -n -modfile ${tools_mod_file} apidiff )"
+apidiff_cmd=$( go tool -n -modfile "${tools_mod_file}" apidiff )
 
 while getopts "cp:d:" o; do
     case "${o}" in

internal/buildscripts/gen-apidiff.sh

@@ -19,7 +19,7 @@ package=""
 output_dir="./internal/data/apidiff"
 repo_toplevel="$( git rev-parse --show-toplevel )"
 tools_mod_file="${repo_toplevel}/internal/tools/go.mod"
-apidiff_cmd="$( go tool -n -modfile ${tools_mod_file} apidiff )"
+apidiff_cmd=$( go tool -n -modfile "${tools_mod_file}" apidiff )
 
 
 while getopts "dp:o:" o; do