b4 prep and --manual-reroll

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Konstantin,

Somehow "b4 send -o dir" followed by "git send-email ..." managed to
produce quoted-printable cover letter message (see
https://lore.kernel.org/all/20221103-omapfb-gpiod-v1-0-c3d53ca7988f@gmail.com/)
and that confused "b4 prep --manual-reroll ..." as this produced a tag
that had "=0D" as line ends. I was able to work around it with the
patch below (not sure if this is right thing to do)...

Also, doing "b4 send --resend" with this series did produce double
signature on the cover letter, even though I see in the code it tries to
remove it.

Thanks.

-- 
Dmitry

diff --git a/b4/ez.py b/b4/ez.py
index 4fcc988..8fb39d2 100644
--- a/b4/ez.py
+++ b/b4/ez.py
@@ -1350,7 +1350,7 @@ def get_sent_tagname(branch: str, tagprefix: str, revstr: Union[str, int]) -> Tu
 def reroll(mybranch: str, cover_msg: email.message.Message, tagprefix: str = SENT_TAG_PREFIX):
     # Prepare annotated tag body from the cover letter
     lsubject = b4.LoreSubject(cover_msg.get('subject'))
-    cbody = cover_msg.get_payload()
+    cbody = cover_msg.get_payload(decode=True).decode()
     # Remove signature
     chunks = cbody.rsplit('\n-- \n')
     if len(chunks) > 1: