clippy

src/function.rs

@@ -336,8 +336,7 @@ impl FunctionEntry {
 		}
 
 		// Plot derivative data
-		if self.derivative {
-			if !self.derivative_data.is_empty() {
+		if self.derivative && !self.derivative_data.is_empty() {
 			plot_ui.line(
 				self.derivative_data
 					.to_line()
@@ -345,7 +344,6 @@ impl FunctionEntry {
 					.name(derivative_str),
 			);
 		}
-		}
 
 		// Plot extrema points
 		if settings.do_extrema {