scripts/get_abi.pl: add a handler for invalid "where" tag

The ABI README file doesn't provide any meaning for a Where:
tag. Yet, a few ABI symbols use it. So, make the parser
handle it, emitting a warning.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/get_abi.pl

@@ -92,6 +92,12 @@ sub parse_abi {
 				}
 			}
 
+			# Invalid, but it is a common mistake
+			if ($new_tag eq "where") {
+				parse_error($file, $ln, "tag 'Where' is invalid. Should be 'What:' instead", $_);
+				$new_tag = "what";
+			}
+
 			if ($new_tag =~ m/what/) {
 				$space = "";
 				if ($tag =~ m/what/) {