Signed-off-by: Hubert Kario <ka...@wit.edu.pl>

diff --git a/cmds-device.c b/cmds-device.c
index a28752f..b1e70f9 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -261,8 +261,6 @@ static int cmd_zero_dev(int argc, char **argv)
        int arg_processed;
        int ret = 0;
        int n;
-       u64 device_len;
-       int mixed_mode_needed = 1; /* keep btrfs_prepare_device() quiet */
 
        if( argc < 2 ) {
                usage(cmd_zero_dev_usage);
@@ -278,8 +276,7 @@ static int cmd_zero_dev(int argc, char **argv)
                        continue;
                }
 
-               n = btrfs_prepare_device(fd, file, &device_len,
-                                        &mixed_mode_needed);
+               n = btrfs_prepare_device(fd, file, NULL, NULL);
                if (n) {
                        fprintf(stderr, "Error when zeroing out %s\n", file);
                        ret |= n;
-- 
1.7.10

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