Kill a sparse warning in 2.6.9-rc3.

Signed-off-by: Arun Sharma <arun.sharma@intel.com>

===== fs/binfmt_elf.c 1.88 vs edited =====
--- 1.88/fs/binfmt_elf.c	Wed Sep 22 13:34:05 2004
+++ edited/fs/binfmt_elf.c	Wed Oct  6 13:16:37 2004
@@ -1032,7 +1032,7 @@
  */
 static int dump_write(struct file *file, const void *addr, int nr)
 {
-	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+	return file->f_op->write(file, (const char __user *) addr, nr, &file->f_pos) == nr;
 }
 
 static int dump_seek(struct file *file, off_t off)