Remove some redundant code

Remove some lingering commented out code and the methods we didn't end
up using in the final implementation.

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

main.py

diff --git a/main.py b/main.py
index d12844c..2e732e3 100755
--- a/main.py
+++ b/main.py
@@ -222,13 +222,6 @@
     return hval
 
 
-def dkim_canonicalize_body(body: bytes) -> bytes:
-    # We only do simple for body (relaxed is unsuitable for patches),
-    # so we just replace all trailing blank lines with a single CRLF
-    body = re.sub(rb'[\r\n]*$', b'', body) + b'\r\n'
-    return body
-
-
 def get_public_key(source: str, keytype: str, identity: str, selector: str) -> Optional[bytes]:
     chunks = identity.split('@', 1)
     if len(chunks) != 2:
@@ -445,12 +438,6 @@
 
 
 def verify_openpgp(sigdata: bytes, pk: Optional[bytes]) -> Optional[bytes]:
-    # We can't pass both the detached sig and the content on stdin, so
-    # use a temporary directory
-    # with tempfile.TemporaryDirectory(suffix='.patch-att-poc') as tmpdir:
-    #
-    #     with open(savefile, 'wb') as fh:
-    #         fh.write(dsig)
     bsigdata = base64.b64decode(sigdata)
     vrfyargs = ['--verify', '--output', '-', '--status-fd=2']
     if pk is not None: