misc: zynq_slcr: Make DB_PRINTs always compile

Change the DB_PRINT macro over to a regular if() rather than
conditional compilation to give constant compile testing of formats.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 942477847353c5cff5f45a228cc88c633dc012f3.1396503037.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/misc/zynq_slcr.c

@@ -19,14 +19,16 @@
 #include "hw/sysbus.h"
 #include "sysemu/sysemu.h"
 
-#ifdef ZYNQ_ARM_SLCR_ERR_DEBUG
+#ifndef ZYNQ_SLCR_ERR_DEBUG
+#define ZYNQ_SLCR_ERR_DEBUG 0
+#endif
+
 #define DB_PRINT(...) do { \
-    fprintf(stderr,  ": %s: ", __func__); \
-    fprintf(stderr, ## __VA_ARGS__); \
+        if (ZYNQ_SLCR_ERR_DEBUG) { \
+            fprintf(stderr,  ": %s: ", __func__); \
+            fprintf(stderr, ## __VA_ARGS__); \
+        } \
     } while (0);
-#else
-    #define DB_PRINT(...)
-#endif
 
 #define XILINX_LOCK_KEY 0x767b
 #define XILINX_UNLOCK_KEY 0xdf0d