ANSI C fix (all variables need to be defined at start of block).

  Fixes Bugzilla #487.

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402637

src/video/x11/SDL_x11events.c

@@ -235,11 +235,11 @@ static int Utf8ToUtf16(const Uint8 *utf8, const int utf8_length, Uint16 *utf16,
     Uint8 const *const end_of_input = utf8 + utf8_length - 1;
 
     while (utf8 <= end_of_input) {
+	Uint8 const c = *utf8;
 	if (p >= max_ptr) {
 	    /* No more output space.  */
 	    return -1;
 	}
-	Uint8 const c = *utf8;
 	if (c < 0x80) {
 	    /* One byte ASCII.  */
 	    *p++ = c;