coreHTTP: remove redundant lower-bound assert for parsing state

[TomasGalbickaNXP]

Description

This PR removes a redundant lower-bound assertion in getFinalResponseStatus():

assert( parsingState >= HTTP_PARSING_NONE &&
        parsingState <= HTTP_PARSING_COMPLETE );

HTTP_PARSING_NONE is 0. Some compilers (observed with IAR EWARM) perform enum range analysis and flag parsingState >= 0 as an always-true / pointless comparison, which breaks builds when warnings are treated as errors.

The upper-bound assert is preserved:

assert( parsingState <= HTTP_PARSING_COMPLETE );

No functional behavior change is intended; this is a build/diagnostic robustness improvement.

Test Steps

Build any project that compiles source/core_http_client.c using IAR EWARM with warnings treated as errors (Werror).
Before this change, IAR reports a “pointless comparison / always true” diagnostic on the lower-bound check (>= HTTP_PARSING_NONE).
After this change, source/core_http_client.c compiles cleanly.

Environment

Toolchain: IAR EWARM (e.g. 9.70.x)
Build mode: warnings-as-errors enabled

Checklist:

• I have tested my changes. No regression in existing tests.
• I have modified and/or added unit-tests to cover the code changes in this Pull Request. (Not applicable; assert-only diagnostic fix.)

Related Issue

N/A (build diagnostic issue observed with IAR when warnings are treated as errors).