checkpatch.pl: check for openocd tree, not for kernel tree

checkpatch.pl looks for linux kernel specific paths and files
to check source tree. As openocd misses kernel files it ends
with this error message:

    Must be run from the top-level dir. of a kernel tree

This patch also renames 'kernel' -> 'openocd'
in source tree-related messages.

Due to checkpatch checking modifications on itself, lift the
restriction on having no spaces at the start of a line for Perl
scripts. This can be readded back later.

Change-Id: I89b7ca976bef5e13785bd3a43e597c9feb4c2df4
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Reviewed-on: http://openocd.zylin.com/2339
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

tools/scripts/checkpatch.pl

@@ -43,7 +43,7 @@ Version: $V
 
 Options:
   -q, --quiet                quiet
-  --no-tree                  run without a kernel tree
+  --no-tree                  run without a openocd tree
   --no-signoff               do not check for 'Signed-off-by' line
   --patch                    treat FILE as patchfile (default)
   --emacs                    emacs compile window format
@@ -52,7 +52,7 @@ Options:
   --subjective, --strict     enable more subjective tests
   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
   --show-types               show the message "types" in the output
-  --root=PATH                PATH to the kernel tree root
+  --root=PATH                PATH to the openocd tree root
   --no-summary               suppress the per-file summary
   --mailback                 only produce a report in case of warnings/errors
   --summary-file             include the filename in summary
@@ -165,14 +165,14 @@ if ($tree) {
 	} else {
 		if (top_of_kernel_tree('.')) {
 			$root = '.';
-		} elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
+		} elsif ($0 =~ m@(.*)/tools/scripts/[^/]*$@ &&
 						top_of_kernel_tree($1)) {
 			$root = $1;
 		}
 	}
 
 	if (!defined $root) {
-		print "Must be run from the top-level dir. of a kernel tree\n";
+		print "Must be run from the top-level dir. of a openocd tree\n";
 		exit(2);
 	}
 }
@@ -401,9 +401,8 @@ sub top_of_kernel_tree {
 	my ($root) = @_;
 
 	my @tree_check = (
-		"COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
-		"README", "Documentation", "arch", "include", "drivers",
-		"fs", "init", "ipc", "kernel", "lib", "scripts",
+		"AUTHORS", "BUGS", "COPYING", "HACKING", "Makefile.am",
+		"README", "contrib", "doc", "src", "tcl", "testing", "tools",
 	);
 
 	foreach my $check (@tree_check) {
@@ -1724,6 +1723,9 @@ sub process {
 			     "please, no space before tabs\n" . $herevet);
 		}
 
+# check we are in a valid C source file if not then ignore this hunk
+		next if ($realfile !~ /\.(h|c)$/);
+
 # check for spaces at the beginning of a line.
 # Exceptions:
 #  1) within comments
@@ -1735,9 +1737,6 @@ sub process {
 			     "please, no spaces at the start of a line\n" . $herevet);
 		}
 
-# check we are in a valid C source file if not then ignore this hunk
-		next if ($realfile !~ /\.(h|c)$/);
-
 # check for RCS/CVS revision markers
 		if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
 			WARN("CVS_KEYWORD",