Fix while_let_on_iterator.stderr

Author: Michael Wright

tests/ui/while_let_on_iterator.stderr

@@ -1,31 +1,31 @@
 error: this loop could be written as a `for` loop
-  --> $DIR/while_loop.rs:6:33
+  --> $DIR/while_let_on_iterator.rs:6:33
    |
 LL |     while let Option::Some(x) = iter.next() {
    |                                 ^^^^^^^^^^^ help: try: `for x in iter { .. }`
    |
    = note: `-D clippy::while-let-on-iterator` implied by `-D warnings`
 
 error: this loop could be written as a `for` loop
-  --> $DIR/while_loop.rs:11:25
+  --> $DIR/while_let_on_iterator.rs:11:25
    |
 LL |     while let Some(x) = iter.next() {
    |                         ^^^^^^^^^^^ help: try: `for x in iter { .. }`
 
 error: this loop could be written as a `for` loop
-  --> $DIR/while_loop.rs:16:25
+  --> $DIR/while_let_on_iterator.rs:16:25
    |
 LL |     while let Some(_) = iter.next() {}
    |                         ^^^^^^^^^^^ help: try: `for _ in iter { .. }`
 
 error: this loop could be written as a `for` loop
-  --> $DIR/while_loop.rs:95:29
+  --> $DIR/while_let_on_iterator.rs:95:29
    |
 LL |         while let Some(v) = y.next() {
    |                             ^^^^^^^^ help: try: `for v in y { .. }`
 
 error: this loop could be written as a `for` loop
-  --> $DIR/while_loop.rs:120:26
+  --> $DIR/while_let_on_iterator.rs:120:26
    |
 LL |     while let Some(..) = values.iter().next() {
    |                          ^^^^^^^^^^^^^^^^^^^^ help: try: `for _ in values.iter() { .. }`