tools/xenstore: don't let hashtable_remove() return the removed value

Letting hashtable_remove() return the value of the removed element is
not used anywhere in Xenstore, and it conflicts with a hashtable
created specifying the HASHTABLE_FREE_VALUE flag.

So just drop returning the value.

This of course requires to free the value if the HASHTABLE_FREE_VALUE
was specified, as otherwise it would be a memory leak.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>

tools/xenstore/hashtable.c

@@ -214,7 +214,7 @@ hashtable_search(struct hashtable *h, void *k)
 }
 
 /*****************************************************************************/
-void * /* returns value associated with key */
+void
 hashtable_remove(struct hashtable *h, void *k)
 {
     /* TODO: consider compacting the table when the load factor drops enough,
@@ -222,7 +222,6 @@ hashtable_remove(struct hashtable *h, void *k)
 
     struct entry *e;
     struct entry **pE;
-    void *v;
     unsigned int hashvalue, index;
 
     hashvalue = hash(h,k);
@@ -236,16 +235,16 @@ hashtable_remove(struct hashtable *h, void *k)
         {
             *pE = e->next;
             h->entrycount--;
-            v = e->v;
             if (h->flags & HASHTABLE_FREE_KEY)
                 free(e->k);
+            if (h->flags & HASHTABLE_FREE_VALUE)
+                free(e->v);
             free(e);
-            return v;
+            return;
         }
         pE = &(e->next);
         e = e->next;
     }
-    return NULL;
 }
 
 /*****************************************************************************/

tools/xenstore/hashtable.h

@@ -68,10 +68,9 @@ hashtable_search(struct hashtable *h, void *k);
  * @name        hashtable_remove
  * @param   h   the hashtable to remove the item from
  * @param   k   the key to search for  - does not claim ownership
- * @return      the value associated with the key, or NULL if none found
  */
 
-void * /* returns value */
+void
 hashtable_remove(struct hashtable *h, void *k);
 
 /*****************************************************************************