fixup! ci: check rustfmt

qa/rustfmt.sh

@@ -1,7 +1,7 @@
 r=0
 cat qa/rustfmt.txt | while read i; do
     rustfmt $i;
-    if [ $(git diff | wc -l) -gt 0 ]; then
+    if [ $(git diff -- $i | wc -l) -gt 0 ]; then
         git diff;
         echo "$i" needs to be formatted
         r=1;