Revert "tools: env: use /run to store lockfile"

In OpenWRT we still use /var/lock as default location for lock files and
/run might not even exist. Revert the upstream change and restore the
previous default path.

This reverts upstream commit
 https://source.denx.de/u-boot/u-boot/-/commit/aeb40f1166e072856f865d26d42a4bea1ec3a514
---
 tools/env/fw_env_main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/tools/env/fw_env_main.c
+++ b/tools/env/fw_env_main.c
@@ -73,7 +73,7 @@ void usage_printenv(void)
 		" -c, --config         configuration file, default:" CONFIG_FILE "\n"
 #endif
 		" -n, --noheader       do not repeat variable name in output\n"
-		" -l, --lock           lock node, default:/run\n"
+		" -l, --lock           lock node, default:/var/lock\n"
 		"\n");
 }
 
@@ -88,7 +88,7 @@ void usage_env_set(void)
 #ifdef CONFIG_FILE
 		" -c, --config         configuration file, default:" CONFIG_FILE "\n"
 #endif
-		" -l, --lock           lock node, default:/run\n"
+		" -l, --lock           lock node, default:/var/lock\n"
 		" -s, --script         batch mode to minimize writes\n"
 		"\n"
 		"Examples:\n"
@@ -206,7 +206,7 @@ int parse_setenv_args(int argc, char *ar
 
 int main(int argc, char *argv[])
 {
-	char *lockname = "/run/" CMD_PRINTENV ".lock";
+	char *lockname = "/var/lock/" CMD_PRINTENV ".lock";
 	int lockfd = -1;
 	int retval = EXIT_SUCCESS;
 	char *_cmdname;