busybox: Fix snprintf arguments in lock

The first argument for snprintf is the buffer and the 2. one is the
size. Fix the order. This broke the lock application.

Fixes: 9d2b26d5a7 ("busybox: fix busybox lock applet pidstr buffer overflow")
Reported-by: Hartmut Birr <e9hack@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit d80336e1a9)

package/utils/busybox/patches/220-add_lock_util.patch

@@ -109,7 +109,7 @@
 +		if (!waitonly) {
 +			lseek(fd, 0, SEEK_SET);
 +			ftruncate(fd, 0);
-+			snprintf(sizeof(pidstr), pidstr, "%d\n", pid);
++			snprintf(pidstr, sizeof(pidstr), "%d\n", pid);
 +			write(fd, pidstr, strlen(pidstr));
 +			close(fd);
 +		}