fix formatting

Author: tomato42

src/ecdsa/der.py

@@ -465,11 +465,7 @@ def unpem(pem):
         pem = pem.encode()
 
     lines = (l.strip() for l in pem.split(b"\n"))
-    d = b"".join(
-        l
-        for l in lines
-        if l and not l.startswith(b"-----")
-    )
+    d = b"".join(l for l in lines if l and not l.startswith(b"-----"))
     return base64.b64decode(d)