staging: dgrp: using vmalloc needs to include vmalloc.h

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgrp/dgrp_specproc.c

@@ -39,6 +39,7 @@
 #include <linux/proc_fs.h>
 #include <linux/ctype.h>
 #include <linux/seq_file.h>
+#include <linux/vmalloc.h>
 
 #include "dgrp_common.h"