libcacard: Fix compilation with gcc-4.7

VCARD_ATR_PREFIX is used as part of an array initializer so it should
not have () around it, so far this happened to work, but gcc-4.7 does
not like it.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

libcacard/vcardt.h

@@ -26,8 +26,8 @@ typedef struct VCardEmulStruct VCardEmul;
 #define MAX_CHANNEL 4
 
 /* create an ATR with appropriate historical bytes */
-#define VCARD_ATR_PREFIX(size) (0x3b, 0x68+(size), 0x00, 0xff, \
-                               'V', 'C', 'A', 'R', 'D', '_')
+#define VCARD_ATR_PREFIX(size) 0x3b, 0x68+(size), 0x00, 0xff, \
+                               'V', 'C', 'A', 'R', 'D', '_'
 
 
 typedef enum {