Fixed nested FFI.

[jorgecarleitao]

This PR fixes a bug in reading FFI children of child (nested types).

[codecov]

Codecov Report

Merging #212 (11b280b) into main (16c089e) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #212      +/-   ##
==========================================
+ Coverage   76.82%   76.87%   +0.04%     
==========================================
  Files         226      226              
  Lines       19419    19430      +11     
==========================================
+ Hits        14919    14937      +18     
+ Misses       4500     4493       -7     

Impacted Files	Coverage Δ
src/ffi/ffi.rs	76.47% <ø> (+1.74%)	⬆️
src/ffi/array.rs	82.71% <100.00%> (+3.00%)	⬆️
src/array/list/mutable.rs	79.20% <0.00%> (+1.98%)	⬆️

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