[PATCH] ns16550: Use correct #define symbol for HAS_IOPORTS

[Andrew Cooper <andrew.cooper3@citrix.com>]

CID 1091471, Regression caused by 7c1de0038895cbc75ebd0caffc5b0f3f03c5ad51

This appears to be a typo which causes check_existence() to unconditionally
return 1 in all cases.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Keir Frser <keir@xen.org>
CC: Jan Beulich <jbeulich@suse.com>
CC: Ian Campbell <ian.campbell@citrix.com>
---
 xen/drivers/char/ns16550.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index 5892eb7..9c2cded 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -503,7 +503,7 @@ static int __init check_existence(struct ns16550 *uart)
 {
     unsigned char status, scratch, scratch2, scratch3;
 
-#ifdef HAS_IO_PORTS
+#ifdef HAS_IOPORTS
     /*
      * We can't poke MMIO UARTs until they get I/O remapped later. Assume that
      * if we're getting MMIO UARTs, the arch code knows what it's doing.
-- 
1.7.10.4