Remove kernel implementation of sprintf

src/kernel/memory/kbrk.c

@@ -3,7 +3,7 @@
 
 static long _brk = KERNEL_BRK0;
 
-long kbrk(long brk, long, long, long, long, long)
+long k_brk(long brk, long, long, long, long, long)
 {
     if(brk)
     {

src/kernel/memory/memory.c

@@ -38,6 +38,4 @@ void memory_init()
             pmm_free(p);
         }
     }
-
-    set_syscall_handler(SYSCALL_BRK, &kbrk);
 }