style: change struct to class, remove parentheses

include/kernel/process.hpp

@@ -8,7 +8,7 @@
 #include <kernel/mm.hpp>
 #include <types/list.hpp>
 
-struct process;
+class process;
 struct thread;
 
 struct process_attr {

src/kernel/mem.cpp

@@ -406,7 +406,7 @@ static inline void map_raw_page_to_pte(
 
 // map page to the end of mm_area in pd
 int k_map(
-    struct mm* mm_area,
+    mm* mm_area,
     const struct page* page,
     int read,
     int write,

src/kernel/process.cpp

@@ -30,9 +30,8 @@ process::process(process&& val)
     attr.system = val.attr.system;
     k_esp = val.k_esp;
 
-    for (auto& item : thds) {
+    for (auto& item : thds)
         item.owner = this;
-    }
 
     val.k_esp = nullptr;
     val.attr.system = 0;