[PMC] Fixed a memory leak in P6LowLevelSig PMC's destroy. Note that the

allocation in the allocate_signature dynop should move into the init_int
VTABLE, to make such leaks easier to track.

src/pmc/p6lowlevelsig.pmc

@@ -1,6 +1,6 @@
 /*
 $Id$
-Copyright (C) 2009, The Perl Foundation.
+Copyright (C) 2009-2010, The Perl Foundation.
 
 =head1 NAME
 
@@ -95,6 +95,9 @@ Frees the memory associated with this PMC's underlying storage.
                 elements[i] = NULL;
             }
 
+        if (elements)
+            mem_sys_free(elements);
+
         /* Now free underlying struct. */
         mem_sys_free(PMC_data(SELF));
         PMC_data(SELF) = NULL;