disas/arm-a64: Add missing compiler attribute GCC_FMT_ATTR

Type fprintf_function which fits here was defined with this attribute.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1437208027-14584-1-git-send-email-sw@weilnetz.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

disas/arm-a64.cc

diff --git a/disas/arm-a64.cc b/disas/arm-a64.cc
index b0803f9..b57256b 100644
--- a/disas/arm-a64.cc
+++ b/disas/arm-a64.cc
@@ -42,7 +42,7 @@
         stream_ = stream;
     }
 
-    void SetPrintf(int (*printf_fn)(FILE *, const char *, ...)) {
+    void SetPrintf(fprintf_function printf_fn) {
         printf_ = printf_fn;
     }
 
@@ -53,7 +53,7 @@
     }
 
 private:
-    int (*printf_)(FILE *, const char *, ...);
+    fprintf_function printf_;
     FILE *stream_;
 };