Fix cast alignment warning in heap_4.c and heap_5.c

[kar-rahul-aws]

Description

Without this change, the code produces the following warning when compiled with -Wcast-align flag:

cast increases required alignment of target type

Test Steps

1. Build the code and see that it does not produce any warning.
2. Run soak tests on GCC ARM CM3 and CM4 platforms.

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.

Related Issue

https://forums.freertos.org/t/freertos-heap-4-c-cast-error/18105

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1aaa318) 94.35% compared to head (fb80bd9) 94.35%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #771   +/-   ##
=======================================
  Coverage   94.35%   94.35%           
=======================================
  Files           6        6           
  Lines        2446     2446           
  Branches      598      598           
=======================================
  Hits         2308     2308           
  Misses         85       85           
  Partials       53       53           

Flag	Coverage Δ
unittests	94.35% <ø> (ø)

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[pete-pjb]

Hi @kar-rahul-aws ,

I have had to revert this PR on my platform (Zynq 7000 ARM CA9 ) it causes my system to fail the very first call to malloc asserting no memory when the scheduler is started.

I don't have much time today to look into it but I may be able to look into it later in the week if you are unable to address it in the meantime...

cc @aggarg
cc @tony-josi-aws
cc @Skptak

Kind Regards,

Pete

[aggarg]

Hey @pete-pjb, Thank you for letting us know. Looking into it!

[aggarg]

This PR should fix the issue - #781. Thanks again!

[pete-pjb]

This PR should fix the issue - #781. Thanks again!

It does indeed fix the issue, thank you @aggarg 🙂

cc @tony-josi-aws
cc @Skptak