fix remove_entry by moving remove_found after remove_all_extra_values

Author: dekellum

src/header/map.rs

@@ -2922,12 +2922,12 @@ impl<'a, T> OccupiedEntry<'a, T> {
     /// assert!(!map.contains_key("host"));
     /// ```
     pub fn remove_entry(self) -> (HeaderName, T) {
-        let entry = self.map.remove_found(self.probe, self.index);
-
-        if let Some(links) = entry.links {
+        if let Some(links) = self.map.entries[self.index].links {
             self.map.remove_all_extra_values(links.next);
         }
 
+        let entry = self.map.remove_found(self.probe, self.index);
+
         (entry.key, entry.value)
     }