DISPATCH-1949: fix ASAN warnings in parse.c

[kgiusti]

No description provided.

[codecov-io]

Codecov Report

Merging #1030 (a5f0ad7) into master (134b1ea) will increase coverage by 3.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1030      +/-   ##
==========================================
+ Coverage   79.02%   82.42%   +3.39%     
==========================================
  Files         112      111       -1     
  Lines       28553    27316    -1237     
==========================================
- Hits        22565    22514      -51     
+ Misses       5988     4802    -1186     

Impacted Files	Coverage Δ
tests/parse_test.c	69.10% <ø> (ø)
src/parse.c	86.87% <100.00%> (-0.20%)	⬇️
src/iterator.c	89.29% <0.00%> (-3.88%)	⬇️
src/router_core/forwarder.c	93.04% <0.00%> (-0.80%)	⬇️
src/router_core/connections.c	88.81% <0.00%> (-0.45%)	⬇️
src/router_core/transfer.c	92.02% <0.00%> (-0.06%)	⬇️
src/adaptors/http2/http2_adaptor.c
src/adaptors/http2/http2_adaptor.h
src/adaptors/http2/http2_adaptor_none.c	0.00% <0.00%> (ø)
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 134b1ea...a5f0ad7. Read the comment docs.

[jiridanek]

I've checked the CI logs: Runtime warnings about shifts have disappeared. CI fails do not look to be related to this PR.