mem: removed unused variables

- two old vars not needed anymore after previous commit

mem/f_malloc.c

@@ -521,8 +521,6 @@ finish:
  */
 static void fm_join_frag(struct fm_block* qm, struct fm_frag* f)
 {
-	int hash;
-	struct fm_frag *pf;
 	struct fm_frag *n;
 
 	n=FRAG_NEXT(f);