checkpatch: use proper way for show problematic line

Instead of using an unnecessarily complicated approach to print a line
that is warned about, use `$herecurr` instead, just like everywhere else
in checkpatch.

While at it, remove a superfluous space in one of the changed lines, too. 
In a unmodified line also remove a superfluous check for a space before a
signed-off-by tag, to me consistent with the check at the start of the
section.

All three problems were found by Joe Perches during review of new code
inspired by the code modified here.

Link: https://lkml.kernel.org/r/a6d455c5196219b2095c2ac3645498052845f32e.1674217480.git.linux@leemhuis.info
Signed-off-by: Thorsten Leemhuis <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Dwaipayan Ray <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Kai Wasserbäch <[email protected]>
Cc: Lukas Bulwahn <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

scripts/checkpatch.pl

@@ -3144,17 +3144,17 @@ sub process {
 			if ($sign_off =~ /^co-developed-by:$/i) {
 				if ($email eq $author) {
 					WARN("BAD_SIGN_OFF",
-					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . "$here\n" . $rawline);
+					      "Co-developed-by: should not be used to attribute nominal patch author '$author'\n" . $herecurr);
 				}
 				if (!defined $lines[$linenr]) {
 					WARN("BAD_SIGN_OFF",
-					     "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline);
-				} elsif ($rawlines[$linenr] !~ /^\s*signed-off-by:\s*(.*)/i) {
+					     "Co-developed-by: must be immediately followed by Signed-off-by:\n" . $herecurr);
+				} elsif ($rawlines[$linenr] !~ /^signed-off-by:\s*(.*)/i) {
 					WARN("BAD_SIGN_OFF",
-					     "Co-developed-by: must be immediately followed by Signed-off-by:\n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
+					     "Co-developed-by: must be immediately followed by Signed-off-by:\n" . $herecurr . $rawlines[$linenr] . "\n");
 				} elsif ($1 ne $email) {
 					WARN("BAD_SIGN_OFF",
-					     "Co-developed-by and Signed-off-by: name/email do not match \n" . "$here\n" . $rawline . "\n" .$rawlines[$linenr]);
+					     "Co-developed-by and Signed-off-by: name/email do not match\n" . $herecurr . $rawlines[$linenr] . "\n");
 				}
 			}