STY: Initialize variable extra using skip_over_whitespace (#3043)

Also tweak comment in skip_over_whitespace.

Author: j-t-1

pypdf/_reader.py

@@ -513,9 +513,8 @@ def read_object_header(self, stream: StreamType) -> Tuple[int, int]:
         # cross-reference table should put us in the right spot to read the
         # object header. In reality some files have stupid cross-reference
         # tables that are off by whitespace bytes.
-        extra = False
         skip_over_comment(stream)
-        extra |= skip_over_whitespace(stream)
+        extra = skip_over_whitespace(stream)
         stream.seek(-1, 1)
         idnum = read_until_whitespace(stream)
         extra |= skip_over_whitespace(stream)

pypdf/_utils.py

@@ -173,7 +173,7 @@ def read_non_whitespace(stream: StreamType) -> bytes:
 
 def skip_over_whitespace(stream: StreamType) -> bool:
     """
-    Similar to read_non_whitespace, but return a boolean if more than one
+    Similar to read_non_whitespace, but return a boolean if at least one
     whitespace character was read.
 
     Args: