fix: test case ut_lind_fs_mmap_no_read

[ChinmayShringi]

Description

Fixes # (issue)

This PR updates the ut_lind_fs_mmap_no_read test to correctly handle the mmap_syscall failure case when a file is opened with write-only permissions (O_WRONLY) and then an attempt is made to map the file with read permissions (PROT_READ | PROT_WRITE). The previous test directly checked the return value of mmap_syscall, which was incorrect. System calls typically return -1 on failure, and the specific error code (EACCES in this case) is stored in errno.

Changes:

• Modified the test to check that mmap_syscall returns -1 to indicate failure.
• Added an additional check to ensure that errno is set to EACCES, which represents "Permission denied" due to the lack of read permissions on the file.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• cargo test ut_lind_fs_mmap_no_read

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)