tty: Compute flip buffer ptrs

The char_buf_ptr and flag_buf_ptr values are trivially derived from
the .data field offset; compute values as needed.

Fixes a long-standing type-mismatch with the char and flag ptrs.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
index e0f2526..ad03039 100644
--- a/include/linux/tty_flip.h
+++ b/include/linux/tty_flip.h
@@ -18,8 +18,8 @@
 {
 	struct tty_buffer *tb = port->buf.tail;
 	if (tb && tb->used < tb->size) {
-		tb->flag_buf_ptr[tb->used] = flag;
-		tb->char_buf_ptr[tb->used++] = ch;
+		*flag_buf_ptr(tb, tb->used) = flag;
+		*char_buf_ptr(tb, tb->used++) = ch;
 		return 1;
 	}
 	return tty_insert_flip_string_flags(port, &ch, &flag, 1);