Description: tools/rtla: Fix clang warning about mount_point var size
References:
Notes:
 carnil> Introduced in a957cbc02531 ("rtla: Add -C cgroup support"). Vulnerable
 carnil> versions: 6.5-rc1.
Bugs:
upstream: released (6.8-rc5) [30369084ac6e27479a347899e74f523e6ca29b89]
6.8-upstream-stable: N/A "Fixed before branching point"
6.7-upstream-stable: released (6.7.6) [6bdd43f62ab3bb5a306af7f0ab857af45777f5a8]
6.6-upstream-stable: released (6.6.18) [8a585914c266dc044f53b5c83c170f79b45fcf9a]
6.1-upstream-stable: N/A "Vulnerable code not present"
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.7-1)
6.1-bookworm-security: N/A "Vulnerable code not present"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"