[PATCH] Char: sx, request regions

Check regions if they are free before we touch them.  Release them in
failpaths.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/sx.h

@@ -35,6 +35,7 @@ struct sx_board {
   void __iomem *base;
   void __iomem *base2;
   unsigned long hw_base;
+  resource_size_t hw_len;
   int eisa_base;
   int port_base; /* Number of the first port */
   struct sx_port *ports;