Fix fmt error

Author: PrestonFrom

clippy_lints/src/matches/significant_drop_in_scrutinee.rs

@@ -8,7 +8,7 @@ use rustc_hir::{Expr, ExprKind, MatchSource};
 use rustc_lint::{LateContext, LintContext};
 use rustc_middle::ty::subst::GenericArgKind;
 use rustc_middle::ty::{Ty, TypeAndMut};
-use rustc_span::{Span};
+use rustc_span::Span;
 
 use super::SIGNIFICANT_DROP_IN_SCRUTINEE;