mpich Fix defects found in Coverity Scan for MPICH-CH4

Pull Request Description

Fix defects found in Coverity Scan for MPICH-CH4

[ ] Provide Description Particularly focus on why, not what. Reference background, issues, test failures, xfail entries, etc.
[x] Commits Follow Good Practice Commits are self-contained and do not do two things at once. Commit message is of the form: module: short description Commit message explains what's in the commit.
[ ] Passes All Tests Whitespace checker. Warnings test. Additional tests via comments.
[x] Contribution Agreement For non-Argonne authors, check contribution agreement. If necessary, request an explicit comment from your companies PR approval manager.

Oct 26 '23 05:10 dycz0fx

test:mpich/ch4/most

Oct 26 '23 05:10 dycz0fx

test:mpich/ch4/most

Oct 26 '23 05:10 dycz0fx

@dycz0fx Please add commit messages describe what each commit is trying to fix

Oct 27 '23 14:10 hzhou

@hzhou Thanks for the reminder! I have added the description in the commits.

Oct 27 '23 15:10 dycz0fx

test:mpich/ch4/most

Oct 27 '23 17:10 dycz0fx

test:mpich/ch4/gpu

Mar 19 '24 17:03 dycz0fx

test:mpich/ch4/gpu

Mar 20 '24 17:03 dycz0fx