hdf5_msb

[svn-r18269] Bug fix for #1732 - The library had segmentation fault when tools call H5Close() after trying 
to open corrupted files.  The problem turned out to be some memory leak when the library 
failed to open the file.  The solution is simply moving some code around to their proper 
places - moving H5AC_unpin_entry(f->shared->sblock) in H5F_dest of H5F.c and moving 
H5G_name_free(root_loc.path) in H5G_mkroot of H5Groot.c.

Tested on jam.  Tested the same change for 1.8.

M    src/H5F.c
M    src/H5Groot.c