Fixes issue 1545
Fixes issue 1545

Fix bug in packed_callstack_cmp() that incorrectly claimed two
callstacks with identical non-module frames were identical regardless
of the subsequent frames.  This resulted in handle leak callstacks
with the same hash being declared identical, leading to false
positives.

SVN-Revision: 1929

sigma-random/drmemory,code4bones/drmemory,sigma-random/drmemory,sigma-random/drmemory,code4bones/drmemory,code4bones/drmemory,code4bones/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,LohithBlaze/drmemory,LohithBlaze/drmemory,LohithBlaze/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,code4bones/drmemory