clean tests/ui/ok_if_let.rs

Cleaning the empty lines for clarity.

tests/ui/ok_if_let.rs

@@ -5,7 +5,6 @@
 
 fn str_to_int(x: &str) -> i32 {
     if let Some(y) = x.parse().ok() {
-
         y
     } else {
         0

tests/ui/ok_if_let.stderr

@@ -2,11 +2,10 @@ error: Matching on `Some` with `ok()` is redundant
   --> $DIR/ok_if_let.rs:7:5
    |
 7  | /     if let Some(y) = x.parse().ok() {
-8  | |
-9  | |         y
-10 | |     } else {
-11 | |         0
-12 | |     }
+8  | |         y
+9  | |     } else {
+10 | |         0
+11 | |     }
    | |_____^
    |
 note: lint level defined here