[openwrt/openwrt] scripts/checkpatch.pl: fix README.md file name after rename

[LEDE Commits]

adrian pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/b99623329c07712c30b5ad2e0f3b3dffe3ed97c2

commit b99623329c07712c30b5ad2e0f3b3dffe3ed97c2
Author: Adrian Schmutzler <freifunk at adrianschmutzler.de>
AuthorDate: Sun Aug 2 15:51:39 2020 +0200

    scripts/checkpatch.pl: fix README.md file name after rename
    
    checkpatch.pl uses a list of files to detect the root OpenWrt
    directory. This includes README, which has been renamed to
    README.md in the previous commit.
    
    Update the file name in checkpatch.pl to prevent errors like the
    following when running the script:
    
       Must be run from the top-level dir. of a OpenWrt tree
    
    Signed-off-by: Adrian Schmutzler <freifunk at adrianschmutzler.de>
---
 scripts/checkpatch.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 5224ea49c3..24793e19d8 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -391,7 +391,7 @@ sub top_of_openwrt_tree {
 	my ($root) = @_;
 
 	my @tree_check = (
-		"BSDmakefile", "Config.in", "LICENSE", "Makefile", "README",
+		"BSDmakefile", "Config.in", "LICENSE", "Makefile", "README.md",
 		"feeds.conf.default", "include", "package", "rules.mk",
 		"scripts", "target", "toolchain", "tools"
 	);