ext2fs: merge sparse fixes for unicode normalization

The sparse script complained about the following issues in the kernel
version of this script.  This patch port the fixes to the userspace
version.

sparse warnings: (new ones prefixed by >>)

>> fs/unicode/utf8-norm.c:41:24: sparse: non-ANSI function declaration
   of function 'utf8version_latest'

vim +/utf8version_latest +41 fs/unicode/utf8-norm.c

  40
> 41	int utf8version_latest()
  42	{
  43		return utf8vers;
  44		}
  45	EXPORT_SYMBOL(utf8version_latest);
  46

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/lib/ext2fs/nls_utf8-norm.c b/lib/ext2fs/nls_utf8-norm.c
index 98c6700..a5ac7c3 100644
--- a/lib/ext2fs/nls_utf8-norm.c
+++ b/lib/ext2fs/nls_utf8-norm.c
@@ -46,7 +46,7 @@
 	return 0;
 }
 
-int utf8version_latest()
+int utf8version_latest(void)
 {
 	return utf8vers;
 }