Fix wf_root

_reformat-common.bash

@@ -49,8 +49,11 @@ wf_root() {
     set -u
 
     arg=$(pwd)/bin/would-reformat.sh
+    PROJECT_ROOT=$(project_root "$arg")
 
-    pr=$(project_root "$arg")
+    pushd "$PROJECT_ROOT" 2>&1 >/dev/null
+
+    pr="$PROJECT_ROOT"
 
     link="$pr/bin/would-reformat.sh"
 
@@ -59,6 +62,8 @@ wf_root() {
 
     out="$original"
 
+    popd 2>&1 >/dev/null
+
     echo "$out"
     return 0
 }