Clippy fixes

qemu-gtk4/src/console_area.rs

@@ -98,7 +98,7 @@ mod imp {
             widget.make_current();
 
             if let Err(e) = unsafe { self.realize_gl() } {
-                let e = glib::Error::new(AppError::GL, &e.to_string());
+                let e = glib::Error::new(AppError::GL, &e);
                 widget.set_error(Some(&e));
             }
         }

qemu-gtk4/src/gstaudio.rs

@@ -17,12 +17,10 @@ fn pcminfo_as_caps(info: &PCMInfo) -> String {
         "{}{}{}",
         if info.is_float {
             "F"
+        } else if info.is_signed {
+            "S"
         } else {
-            if info.is_signed {
-                "S"
-            } else {
-                "U"
-            }
+            "U"
         },
         info.bits,
         if info.be { "BE" } else { "LE" }