package/zchunk: fix symbol conflict

Backport a patch to fix a symbol conflict issue.

Fixes:
 - http://autobuild.buildroot.net/results/225/22590a7038a40da3700d56c1f82f7dc74225702a

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/zchunk/0002-zck-declare-write_data-as-static.patch

@@ -0,0 +1,34 @@
+From 477c4e891bd4d9e41fcbaa07cd1a37c0975df5cc Mon Sep 17 00:00:00 2001
+From: James Hilliard <james.hilliard1@gmail.com>
+Date: Wed, 4 May 2022 16:32:48 -0600
+Subject: [PATCH] zck: declare write_data as static
+
+This needs to be declared static to avoid a symbol conflict:
+io.c:(.text+0xe8): multiple definition of `write_data'; src/zck.p/zck.c.o:zck.c:(.text+0x1f4): first defined here
+
+Fixes:
+ - http://autobuild.buildroot.net/results/225/22590a7038a40da3700d56c1f82f7dc74225702a
+
+Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
+[james.hilliard1@gmail.com: backport from upstream commit
+477c4e891bd4d9e41fcbaa07cd1a37c0975df5cc]
+---
+ src/zck.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/zck.c b/src/zck.c
+index 7727479..83b2630 100644
+--- a/src/zck.c
++++ b/src/zck.c
+@@ -159,7 +159,7 @@ static error_t parse_opt (int key, char *arg, struct argp_state *state) {
+ 
+ static struct argp argp = {options, parse_opt, args_doc, doc};
+ 
+-void write_data(zckCtx *zck, char *data, ssize_t in_size) {
++static void write_data(zckCtx *zck, char *data, ssize_t in_size) {
+     if(zck_write(zck, data, in_size) < 0) {
+         LOG_ERROR("%s", zck_get_error(zck));
+         exit(1);
+-- 
+2.25.1
+