checkpatch: don't print the next line if not defined

When checking if "Reported-by" tag is followed by "Link:", there is no
need to print the next line if there is no next line.

While at it, also mention in this case that the "Link:" tag should be
followed by a URL, similar to the next warning.

By doing that, the code is now similar to what is done above when checking
if the Co-developed-by tag is properly used.

Link: https://lkml.kernel.org/r/20230314-doc-checkpatch-closes-tag-v4-2-d26d1fa66f9f@tessares.net
Fixes: d7f1d71 ("checkpatch: warn when Reported-by: is not followed by Link:")
Signed-off-by: Matthieu Baerts <[email protected]>
Acked-by: Joe Perches <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Bagas Sanjaya <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Dwaipayan Ray <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Kai Wasserbäch <[email protected]>
Cc: Konstantin Ryabitsev <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Lukas Bulwahn <[email protected]>
Cc: Thorsten Leemhuis <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

scripts/checkpatch.pl

@@ -3162,7 +3162,7 @@ sub process {
 			if ($sign_off =~ /^reported(?:|-and-tested)-by:$/i) {
 				if (!defined $lines[$linenr]) {
 					WARN("BAD_REPORTED_BY_LINK",
-					     "Reported-by: should be immediately followed by Link: to the report\n" . $herecurr . $rawlines[$linenr] . "\n");
+					     "Reported-by: should be immediately followed by Link: with a URL to the report\n" . $herecurr . "\n");
 				} elsif ($rawlines[$linenr] !~ m{^link:\s*https?://}i) {
 					WARN("BAD_REPORTED_BY_LINK",
 					     "Reported-by: should be immediately followed by Link: with a URL to the report\n" . $herecurr . $rawlines[$linenr] . "\n");