commit 0c01921 ("checkpatch: add new warnings to author signoff checks.")
introduced new checks for author sign off. The format_email procedure
was modified to add comment blocks to the formatted email. But no
space was added between email address and the mail comment.

This caused issues in some cases where the email was in the form
of "author@example.com (Comment block)". The formatted email removed
the space at the end of address.

An evaluation on checkpatch brought up this case. For example,
on commit 1129d31b55d5 ("ima: Fix ima digest hash table key calculation"),
the following warning was reported:

WARNING:BAD_SIGN_OFF: email address 'David.Laight@aculab.com (big endian
system concerns)' might be better as 'David.Laight@aculab.com(big endian
system concerns)'

Resolved this by adding a single space in between the address and comment
when the extracted comment is not empty.

Signed-off-by: Dwaipayan Ray <dwaipayanray1@gmail.com>
---
 scripts/checkpatch.pl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 124ff9432b51..6000addf1af3 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl

@@ -1201,7 +1201,9 @@ sub format_email {
 	} else {
 		$formatted_email = "$name$name_comment <$address>";
 	}
-	$formatted_email .= "$comment";
+	if ("$comment" ne "") {
+		$formatted_email .= " $comment";
+	}
 	return $formatted_email;
 }
 

-- 
2.27.0

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