checkstack: fix printed address

commit ee34db3f271cea4d4252048617919c2caafe698b upstream.

All addresses printed by checkstack have an extra incorrect 0 appended at
the end.

This was introduced with commit 677f1410e058 ("scripts/checkstack.pl: don't
display $dre as different entity"): since then the address is taken from
the line which contains the function name, instead of the line which
contains stack consumption. E.g. on s390:

0000000000100a30 <do_one_initcall>:
...
  100a44:       e3 f0 ff 70 ff 71       lay     %r15,-144(%r15)

So the used regex which matches spaces and hexadecimal numbers to extract
an address now matches a different substring. Subsequently replacing spaces
with 0 appends a zero at the and, instead of replacing leading spaces.

Fix this by using the proper regex, and simplify the code a bit.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 677f1410e058 ("scripts/checkstack.pl: don't display $dre as different entity")
Signed-off-by: Heiko Carstens <[email protected]>
Cc: Maninder Singh <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Vaneet Narang <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

scripts/checkstack.pl

@@ -142,15 +142,11 @@ $total_size = 0;
 while (my $line = <STDIN>) {
 	if ($line =~ m/$funcre/) {
 		$func = $1;
-		next if $line !~ m/^($xs*)/;
+		next if $line !~ m/^($x*)/;
 		if ($total_size > $min_stack) {
 			push @stack, "$intro$total_size\n";
 		}
-
-		$addr = $1;
-		$addr =~ s/ /0/g;
-		$addr = "0x$addr";
-
+		$addr = "0x$1";
 		$intro = "$addr $func [$file]:";
 		my $padlen = 56 - length($intro);
 		while ($padlen > 0) {