fix logic for logging step 5, output should now trigger two errors in a row

exercise/logging/src/lib.rs

@@ -26,8 +26,9 @@ impl Frog {
         }
     }
     pub fn sleep(&mut self) {
-        if !self.sleeping {
+        if self.sleeping {
             // 5. Use error!() to log a (non-fatal) error stating that the Frog is already asleep
+        } else {
             self.sleeping = true;
         }
     }

exercise/logging/src/main.rs

@@ -19,6 +19,7 @@ fn main() {
     skippy.hop();
     skippy.hop();
     skippy.sleep();
+    skippy.sleep();
 
     // Challenge: Go back to lib.rs and set the `target: ` argument for each logging call to be the
     // path to the function.  For example, `Frog::new`