scripts: get_abi.pl: fix fallback rule for undefined symbols

The rule that falls back to the long regex list is wrong:
it is just running again the same loop it did before.

change it to look at the "others" table.

That slows the processing speed, but provides a better
list of undefined symbols.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/a3ba919e9a9208a5f012a13c9674c362a9d73169.1632994565.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/get_abi.pl

@@ -746,7 +746,7 @@ sub check_file($$)
 	}
 
 	if ($leave ne "others") {
-		my @expr = @{$leaf{$leave}->{expr}};
+		my @expr = @{$leaf{"others"}->{expr}};
 		for (my $i = 0; $i < @names; $i++) {
 			foreach my $re (@expr) {
 				print STDERR "$names[$i] =~ /^$re\$/\n" if ($debug && $dbg_undefined);