[Cache] Fix invalid pointer use for returned user home

src/cache.rs

@@ -20,7 +20,7 @@ use std::collections::HashMap;
 use std::sync::{Mutex, MutexGuard};
 
 use libc::{geteuid, seteuid, getpwnam, uid_t};
-use std::ffi::CString;
+use std::ffi::{CStr, CString};
 
 use oauth2::basic::BasicTokenResponse;
 
@@ -114,7 +114,7 @@ impl Cache {
         };
         let user_home;
         unsafe {
-           user_home = CString::from_raw((*getpwnam(nam.as_ptr())).pw_dir);
+           user_home = CStr::from_ptr((*getpwnam(nam.as_ptr())).pw_dir);
         };
 
         env::set_var("HOME", user_home.to_str().unwrap());