Description, Comments and tests for statfs_syscall & fstatfs_syscall

[pranav-bhatt]

Description

This PR adds comments and tests for the statfs_syscall & fstatfs_syscall system call function.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

For the unit tests added, run ``

• Test A - safeposix-rust/tests/fs_tests.rs - ut_lind_fs_statfs_syscall_tests(),
• Test B - safeposix-rust/tests/fs_tests.rs - ut_lind_fs_fstatfs_syscall_tests()

Checklist:

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been added to a pull request and/or merged in other modules (native-client, lind-glibc, lind-project)

[ve1nard]

a couple of comments

[namanlalitnyu]

some minor comments.

[pranav-bhatt]

@ve1nard @namanlalitnyu sorry for the confusion, this PR was branched off of another branch with stat calls. This one isnt ready to be reviewed yet but I accidentally marked it as ready

[namanlalitnyu]

LGTM!

[ve1nard]

lgtm

[yashaswi2000]

LGTM

[rennergade]

Approved. Looks great!