vboot: fix a typo in CL:2112321

CL:2112321 inadvertently removed the escape on a \n newline
in a VB2_DEBUG string.  Put it back.

BUG=b:124141368, chromium:968464
TEST=make clean && make runtests
BRANCH=none

Change-Id: I19ee4a77d3cc58d6995212151b381ae76c602a42
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2174039
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
Tested-by: Joel Kitching <kitching@chromium.org>
diff --git a/firmware/2lib/2misc.c b/firmware/2lib/2misc.c
index 86b88d9..baa5013 100644
--- a/firmware/2lib/2misc.c
+++ b/firmware/2lib/2misc.c
@@ -161,7 +161,7 @@
 	/* If recovery reason is non-zero, tell caller we need recovery mode */
 	if (sd->recovery_reason) {
 		ctx->flags |= VB2_CONTEXT_RECOVERY_MODE;
-		VB2_DEBUG("We have a recovery request: %#x / %#xn",
+		VB2_DEBUG("We have a recovery request: %#x / %#x\n",
 			  sd->recovery_reason,
 			  vb2_nv_get(ctx, VB2_NV_RECOVERY_SUBCODE));
 	}