Merge fixes

tests/ui/println_empty_string.fixed

@@ -1,4 +1,5 @@
 // run-rustfix
+#![allow(clippy::match_single_binding)]
 
 fn main() {
     println!();

tests/ui/println_empty_string.rs

@@ -1,4 +1,5 @@
 // run-rustfix
+#![allow(clippy::match_single_binding)]
 
 fn main() {
     println!();

tests/ui/println_empty_string.stderr

@@ -1,5 +1,5 @@
 error: using `println!("")`
-  --> $DIR/println_empty_string.rs:5:5
+  --> $DIR/println_empty_string.rs:6:5
    |
 LL |     println!("");
    |     ^^^^^^^^^^^^ help: replace it with: `println!()`
@@ -7,7 +7,7 @@ LL |     println!("");
    = note: `-D clippy::println-empty-string` implied by `-D warnings`
 
 error: using `println!("")`
-  --> $DIR/println_empty_string.rs:8:14
+  --> $DIR/println_empty_string.rs:9:14
    |
 LL |         _ => println!(""),
    |              ^^^^^^^^^^^^ help: replace it with: `println!()`