futility: send debug messages to stdout, not stderr

It's more useful to see the debug messages interleaved with the
regular output instead of going to a separate stream.

BUG=none
BRANCH=none
TEST=make runtests

Try:

  futility --debug show tests/futility/data/bios_zgb_mp.bin | less

Change-Id: I43526821fc93b2af4d6d01b3bc2465e5b9672e26
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/262717
Reviewed-by: Randall Spangler <rspangler@chromium.org>
diff --git a/futility/misc.c b/futility/misc.c
index c01cb97..c002a13 100644
--- a/futility/misc.c
+++ b/futility/misc.c
@@ -36,8 +36,8 @@
 
 	va_list ap;
 	va_start(ap, format);
-	fprintf(stderr, "DEBUG: ");
-	vfprintf(stderr, format, ap);
+	fprintf(stdout, "DEBUG: ");
+	vfprintf(stdout, format, ap);
 	va_end(ap);
 }