Cast argument to int for format string

regress/nonrandomopentest.c

diff --git a/regress/nonrandomopentest.c b/regress/nonrandomopentest.c
index 95bdf9b..56f946e 100644
--- a/regress/nonrandomopentest.c
+++ b/regress/nonrandomopentest.c
@@ -54,7 +54,7 @@
 	exit(1);
     }
     if (read(fd, buf, sizeof(buf)) < sizeof(buf)) {
-	fprintf(stderr, "can't read %d bytes: %s\n", sizeof(buf), strerror(errno));
+	fprintf(stderr, "can't read %d bytes: %s\n", (int)sizeof(buf), strerror(errno));
 	exit(1);
     }
     close(fd);