send-email: --no-signed-off-cc should suppress 'sob' cc

The logic to countermand suppression of Cc to the signers with a more
explicit --signed-off-by option done in 6564828 (git-send-email:
Generalize auto-cc recipient mechanism) suffers from a double-negation
error.

A --signed-off-cc option, when false, should actively suppress CC: to be
generated out of S-o-b lines, and it should refrain from suppressing when
it is true.

It also fixes "(sob) Adding cc:" status output; earlier it included the
line terminator LF inside '%s', which was totally bogus.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -317,7 +317,7 @@ sub read_config {
 
 # If explicit old-style ones are specified, they trump --suppress-cc.
 $suppress_cc{'self'} = $suppress_from if defined $suppress_from;
-$suppress_cc{'sob'} = $signed_off_cc if defined $signed_off_cc;
+$suppress_cc{'sob'} = !$signed_off_cc if defined $signed_off_cc;
 
 # Debugging, print out the suppressions.
 if (0) {
@@ -855,6 +855,7 @@ sub send_message
 			$message .=  $_;
 			if (/^(Signed-off-by|Cc): (.*)$/i) {
 				next if ($suppress_cc{'sob'});
+				chomp;
 				my $c = $2;
 				chomp $c;
 				next if ($c eq $sender and $suppress_cc{'self'});