fix clippy

Author: sunhaosheng-kylin

api/src/syscall/mm/brk.rs

@@ -3,19 +3,21 @@ use axhal::paging::{MappingFlags, PageSize};
 use axmm::backend::Backend;
 use axtask::current;
 use memory_addr::{VirtAddr, align_up_4k};
-use starry_core::task::AsThread;
-use starry_core::config::{USER_HEAP_BASE, USER_HEAP_SIZE, USER_HEAP_SIZE_MAX};
+use starry_core::{
+    config::{USER_HEAP_BASE, USER_HEAP_SIZE, USER_HEAP_SIZE_MAX},
+    task::AsThread,
+};
 
 pub fn sys_brk(addr: usize) -> AxResult<isize> {
     let curr = current();
     let proc_data = &curr.as_thread().proc_data;
     let current_top = proc_data.get_heap_top() as usize;
     let heap_limit = USER_HEAP_BASE + USER_HEAP_SIZE_MAX;
-    
+
     if addr == 0 {
         return Ok(current_top as isize);
     }
-    
+
     if addr < USER_HEAP_BASE || addr > heap_limit {
         return Ok(current_top as isize);
     }
@@ -24,23 +26,27 @@ pub fn sys_brk(addr: usize) -> AxResult<isize> {
     let current_top_aligned = align_up_4k(current_top);
     // Initial heap region end address (already mapped during ELF loading)
     let initial_heap_end = USER_HEAP_BASE + USER_HEAP_SIZE;
-    
+
     // Only map new pages when expanding beyond already mapped region
     // Expansion start should be the greater of initial_heap_end and current_top_aligned
     if new_top_aligned > current_top_aligned {
         let expand_start = VirtAddr::from(initial_heap_end.max(current_top_aligned));
         let expand_size = new_top_aligned.saturating_sub(expand_start.as_usize());
 
-        if expand_size > 0 {
-            if proc_data.aspace.lock().map(
-                expand_start,
-                expand_size,
-                MappingFlags::READ | MappingFlags::WRITE | MappingFlags::USER,
-                false,
-                Backend::new_alloc(expand_start, PageSize::Size4K),
-            ).is_err() {
-                return Ok(current_top as isize);
-            }
+        if expand_size > 0
+            && proc_data
+                .aspace
+                .lock()
+                .map(
+                    expand_start,
+                    expand_size,
+                    MappingFlags::READ | MappingFlags::WRITE | MappingFlags::USER,
+                    false,
+                    Backend::new_alloc(expand_start, PageSize::Size4K),
+                )
+                .is_err()
+        {
+            return Ok(current_top as isize);
         }
     }