libstdc++/10276: memory leak for stringstream / ios_base callback cache.

[ehrhardt@mathematik.uni-ulm.de]

Synopsis: memory leak for stringstream / ios_base callback cache.

State-Changed-From-To: open->feedback
State-Changed-By: cae
State-Changed-When: Mon Mar 31 17:20:22 2003
State-Changed-Why:
    Do you actually see a memory leak? As far as I can see _M_dispose_callbacks()
    (called by the ios_base destructor) should free the memory.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10276