hdf5_chunking_query_bmr

[svn-r18256] Description:
    Bring changes from Coverity fixing branch to trunk:

r18235:
Fixed coverity 114:
   if (NULL ==_dest)
      H5MM_free(dest);

r18236:
   Close Coverity issue #28 (again :-) by working through the logic of the
routine more thoroughly to eliminate the goto statements. (LK & QK)

r18237:
fixed coverity 133:
   if (NULL==_dest && NULL==ret_value && NULL != dest)
      H5MM_free(dest);

r18238:
Fix coverity items 421 and 422.  Added assertion that the heap's free list is
NULL when entering H5HL_fl_deserialize, guarateeing that the free list will
always be linked in even on failure.

r18239:
Fix coverity item 268.  Changed H5MM_xfree(read_buf) to read_buf = 
H5MM_xfree(read_buf) so that read_buf isn't manipulated after it's been freed.

r18241:
coverity fix: use correct free functon H5FL_FREE()from the previous fix

r18242:
Coverity fix 139: Free dst correctly in H5O_sdspace_copy().

r18243:
   Fix Coverity issue #417 by checking for NULL return value from
setup_cache() (LK & QK)

r18244:
Coverity Fix 132: free dest correctly in H5O_efl_copy()

r18245:
Issue 121:  H5S_hyper_make_spans() cannot deal with counts of 0. However,
H5Sselect_hyperslab() API does allow a count of 0.
Therefore, simply throw an error if this function encounters a count of 0.

r18246:
Check file_ptr to address coverity issue # 418

r18247:
Fixed coverity 113: 
   if (sequence)
      H5MM_xfree(sequence);

r18248:
    Coverity issue #414 by checking for NULL return from setup_cache() (LK & QK)

r18249:
fixed coverity 274: moved H5FL_FREE(H5A_t, attr); to a line above so that if
attr is null, it will not free it.

r18250:
Fix coverity issue #86.

Check return of malloc function to ensure non-null before continuing.


Tested on:
    Mac OS X/32 10.6.2 (amazon) w/debug & production)
    (h5committested in daily tests on branch)