chore: Remove unreachable return statements

[PApostol]

Remove unreachable return statements in superset/utils/network.py.

SUMMARY

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #17622 (8a00245) into master (0544bee) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master   #17622   +/-   ##
=======================================
  Coverage   68.55%   68.55%           
=======================================
  Files        1601     1601           
  Lines       65271    65270    -1     
  Branches     6966     6966           
=======================================
+ Hits        44745    44746    +1     
+ Misses      18636    18634    -2     
  Partials     1890     1890           

Flag	Coverage Δ
hive	81.39% <0.00%> (+<0.01%)	⬆️
mysql	81.80% <0.00%> (+<0.01%)	⬆️
postgres	81.81% <0.00%> (+<0.01%)	⬆️
presto	81.69% <0.00%> (+<0.01%)	⬆️
python	82.31% <0.00%> (+<0.01%)	⬆️
sqlite	81.50% <0.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
superset/utils/network.py	37.93% <0.00%> (+2.44%)	⬆️
superset/db_engine_specs/presto.py	90.39% <0.00%> (ø)
superset/charts/schemas.py	99.33% <0.00%> (+<0.01%)	⬆️

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[villebro]

bycatch: I notice that port is an int in the argument list, but we're recasting it to int on line 33, which is unnecessary. While we're at it, I'd almost recommend removing that cast, and make sure code ever calls this function with anything except an int value.

[PApostol]

Good spot; I have taken out the int cast - by the looks of it, is_port_open() is only used here, where port is indeed an integer.