Refactor statement to determine width of range

Author: rspencer01

clippy_lints/src/methods/map_with_unused_argument_over_ranges.rs

@@ -29,13 +29,11 @@ fn extract_count_with_applicability(
             && let LitKind::Int(Pu128(upper_bound), _) = lit.node
         {
             // Here we can explicitly calculate the number of iterations
-            let count = if upper_bound > lower_bound {
+            let count = if upper_bound >= lower_bound {
                 match range.limits {
                     RangeLimits::HalfOpen => upper_bound - lower_bound,
                     RangeLimits::Closed => upper_bound - lower_bound + 1,
                 }
-            } else if upper_bound == lower_bound && range.limits == RangeLimits::Closed {
-                1
             } else {
                 0
             };