includes: Fix format string

The format strings for QB_HDB_D_FORMAT & QB_HDB_X_FORMAT had no spaces
between "%" and PRIx64. This is allowed, but technically incorrect and
breaks C++11

Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>

include/qb/qbhdb.h

@@ -49,8 +49,8 @@ typedef uint64_t qb_handle_t;
 /*
  * Formatting for string printing on 32/64 bit systems
  */
-#define QB_HDB_D_FORMAT "%"PRIu64
-#define QB_HDB_X_FORMAT "%"PRIx64
+#define QB_HDB_D_FORMAT "%" PRIu64
+#define QB_HDB_X_FORMAT "%" PRIx64
 
 struct qb_hdb_handle {
 	int32_t state;