tests: Update futility show expected test output

If you read the manpage for printf *really* closely, it seems that the
%#x token only prints the 0x prefix for non-zero values. Huh... never
knew that (and our firmware implementations in fact don't honor that,
but glibc does). Anyway, I think we're fine with either behavior but
this broke the expected output for one of our futility tests, which this
patch fixes (originally broken in CL:1840191).

BRANCH=None
BUG=None
TEST=make runtests

Change-Id: Id54ff6f56e02333ab01b09b75deb16f47da01bc3
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1885411
Reviewed-by: Joel Kitching <kitching@chromium.org>
diff --git a/tests/futility/expect_output/show.tests_futility_data_kern_preamble.bin b/tests/futility/expect_output/show.tests_futility_data_kern_preamble.bin
index d1ceb03..359f45c 100644
--- a/tests/futility/expect_output/show.tests_futility_data_kern_preamble.bin
+++ b/tests/futility/expect_output/show.tests_futility_data_kern_preamble.bin
@@ -14,7 +14,7 @@
   Body size:             0x12000
   Bootloader address:    0x10a000
   Bootloader size:       0x8000
-  Flags:                 0x0
+  Flags:                 0
 Body verification succeeded.
 Config:
 hi there