Delete two left-over print statements

exec.c

@@ -20,7 +20,6 @@ exec(char *path, char **argv)
 
   begin_op();
 
-  cprintf("exec %s\n", path);
   if((ip = namei(path)) == 0){
     end_op();
     return -1;
@@ -100,7 +99,6 @@ exec(char *path, char **argv)
   proc->tf->esp = sp;
   switchuvm(proc);
   freevm(oldpgdir);
-  cprintf("exec succeeded\n");
   return 0;
 
  bad: