[U-Boot] [PATCH] mkimage: do not fail if there is no print_header function

[Guillaume GARDET]

Commit 253c60a breaks the exit value of 'mkimage -T rkimage'
and print the following  error:
  mkimage: Can't print header for Rockchip Boot Image support: Success

It is not a failure to not print headers, so just display the warning message,
and finish the function properly.

Signed-off-by: Guillaume GARDET <guillaume.gardet at free.fr>

Cc: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Tom Rini <trini at konsulko.com>
---
 tools/mkimage.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/mkimage.c b/tools/mkimage.c
index 28ff35e670..4e561820e7 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -588,9 +588,8 @@ int main(int argc, char **argv)
 	if (tparams->print_header)
 		tparams->print_header (ptr);
 	else {
-		fprintf (stderr, "%s: Can't print header for %s: %s\n",
-			params.cmdname, tparams->name, strerror(errno));
-		exit (EXIT_FAILURE);
+		fprintf (stderr, "%s: Can't print header for %s\n",
+			params.cmdname, tparams->name);
 	}
 
 	(void) munmap((void *)ptr, sbuf.st_size);
-- 
2.13.6