gen_hashed_bin.py: open file in binary mode

By default Python tries to open files in text mode. This is
okay for python2, because it uses 8-bit encoding.
But python3 tries to decode file as utf-8 encoded and fails,
because it is a binary file.

Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

Author: lorc

scripts/gen_hashed_bin.py

@@ -67,7 +67,7 @@ def append_to(outf, start_offs, in_fname, max_bytes=0xffffffff):
 def append_hashes(outf, in_fname):
     page_size = 4 * 1024
 
-    inf = open(in_fname, 'r')
+    inf = open(in_fname, 'rb')
     while True:
         page = inf.read(page_size)
         if len(page) == page_size: