Move items_count assignment to the else branch

Author: ivxvm

src/libproc/proc_pid.rs

@@ -235,13 +235,13 @@ pub fn listpids(proc_types: ProcType) -> Result<Vec<u32>, String> {
     let capacity = buffer_size as usize / mem::size_of::<u32>();
     let mut pids: Vec<u32> = Vec::with_capacity(capacity);
     let buffer_ptr = pids.as_mut_ptr() as *mut c_void;
-
+    
     let ret = unsafe { proc_listpids(proc_types as u32, 0, buffer_ptr, buffer_size as u32) };
-    let items_count = ret as usize / mem::size_of::<u32>() - 1;
 
     if ret <= 0 {
         Err(get_errno_with_message(ret))
     } else {
+        let items_count = ret as usize / mem::size_of::<u32>() - 1;
         unsafe {
             pids.set_len(items_count);
         }