checkpatch: allow space leading blank lines in email headers

checkpatch: allow space leading blank lines in email headers

Allow a leading space and otherwise blank link in the email headers as
it can be a line wrapped Spamassassin multiple line string or any other
valid rfc 2822/5322 email header.

The line with space causes checkpatch to erroneously think that it's in
the content body, as opposed to headers and thus flag a mail header as
an unwrapped long comment line.

Link: http://lkml.kernel.org/r/d75a9f0b78b3488078429f4037d9fff3bdfa3b78.1490247180.git.joe@perches.com
Signed-off-by: Joe Perches <[email protected]>Reported-by: Darren Hart (VMware) <[email protected]>
Tested-by: Darren Hart (VMware) <[email protected]>
Reviewed-by: Darren Hart (VMware) <[email protected]>
Original-patch-by: John 'Warthog9' Hawley (VMware) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>