Reset the result flag after use

[ztravis]

I think this is a bug - the result variable is used for the result of this initial computation but isn't cleared afterwards. If the subsequent traversal fails to find a leaf node, it's possible for it to return this old value.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 14.99%. Comparing base (2b160d2) to head (aa176c7).

Files	Patch %	Lines
libpff/libpff_local_descriptors.c	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (2b160d2) and HEAD (aa176c7). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (2b160d2)	HEAD (aa176c7)
	4	2

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
- Coverage   23.66%   14.99%   -8.67%     
==========================================
  Files          63       63              
  Lines       20608    20609       +1     
  Branches     4966     4966              
==========================================
- Hits         4876     3091    -1785     
- Misses      14615    16989    +2374     
+ Partials     1117      529     -588     

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