uint64_t format fixes

Signed-off-by: Anestis Bechtsoudis <anestis@census-labs.com>
diff --git a/files.c b/files.c
index ddf0069..57f38c2 100644
--- a/files.c
+++ b/files.c
@@ -429,7 +429,7 @@
         }
 
         hfuzz->blacklist[hfuzz->blacklistCnt] = strtoull(lineptr, 0, 16);
-        LOG_D("Blacklist: loaded %'" PRId64 "'", hfuzz->blacklist[hfuzz->blacklistCnt]);
+        LOG_D("Blacklist: loaded %'" PRIu64 "'", hfuzz->blacklist[hfuzz->blacklistCnt]);
 
         // Verify entries are sorted so we can use interpolation search
         if (hfuzz->blacklistCnt > 1) {