We don't actually have a stdio.h header file. Our printf() functions are

defined in vsprintf.h.  (This may change, since vsprintf.h is a
non-standard name, but for now it's the one to use.)

There should be no need to include vsprintf.h just for DBG() statements,
since include/compiler.h forces it in for a debug build anyway.

src/core/buffer.c

@@ -38,7 +38,6 @@
  *
  */
 
-#include "stdio.h"
 #include "stddef.h"
 #include "string.h"
 #include "io.h"

src/core/device.c

@@ -19,7 +19,6 @@
 #include <gpxe/list.h>
 #include <gpxe/tables.h>
 #include <gpxe/device.h>
-#include "stdio.h"
 
 /**
  * @file

src/core/malloc.c

@@ -16,7 +16,6 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
-#include <stdio.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>

src/core/osloader.c

@@ -29,7 +29,6 @@ Modifications: Ken Yap (for Etherboot/16)
  * your option) any later version.
  */
 
-#include "stdio.h"
 #include "io.h"
 #include "memsizes.h"
 

src/core/resolv.c

@@ -1,5 +1,4 @@
 #include "resolv.h"
-#include "stdio.h"
 
 static struct resolver resolvers[0] __table_start(resolver);
 static struct resolver resolvers_end[0] __table_end(resolver);