Elfutils module reporting

[Nurdin Premji <npremji@redhat.com>]

Roland, I'm trying to refresh dwfl objects in terms of the dwfl_modules. 
To optimize code and not create a new dwfl object every time a task changes.
As a first pass I was trying to remove all old modules and re-report new 
modules just by using dwfl_report_begin and dwfl_report_end. The 
libdwfl.h comments lead me to believe this is all that is necessary to 
remove all old modules and report only new modules. I plan to switch to 
dwfl_report_begin_add later on and only report modules that have changed.

I got an assertion failure at the dwfl_report_end stage
 /home/yyz/npremji/mainworkspace/frysk/frysk-imports/elfutils/libdwfl/dwfl_module.c:249: 
dwfl_report_end: Assertion `i == dwfl->nmodules' failed.

Looking at the dwfl_module.c file I see that dwfl_report_begin calls 
dwfl_report_begin_add, which clears all the modules. I thought that this 
function was supposed to preserver all the old modules?

Also how would I go about removing single modules in an updating 
scenario? i.e. is there a dwfl_report_remove_module function to link 
with dwfl_report_begin_add?

Thank you,
Nurdin.