[ndctl patch] zero_info_block: skip seed devices

[Jeff Moyer]

Currently, ndctl destroy-namespace -f all will output errors of the
form:

  Error: destroy namespace: namespace0.0 failed to enable for zeroing, 
continuing

for any zero-sized namespace.  That particular namespace looks like this:

  {
    "dev":"namespace0.0",
    "mode":"raw",
    "size":0,
    "uuid":"00000000-0000-0000-0000-000000000000",
    "sector_size":512,
    "state":"disabled"
  }

This patch skips over namespaces with size=0 when zeroing out info
blocks.

Fixes: 46654c2d60b70 ("ndctl/namespace: Always zero info-blocks")
Reported-by: Zhang Yi <yiz...@redhat.com>
Signed-off-by: Jeff Moyer <jmo...@redhat.com>

diff --git a/ndctl/namespace.c b/ndctl/namespace.c
index 0c8df9f..de1e08f 100644
--- a/ndctl/namespace.c
+++ b/ndctl/namespace.c
@@ -1052,6 +1052,9 @@ static int zero_info_block(struct ndctl_namespace *ndns)
        void *buf = NULL, *read_buf = NULL;
        char path[50];
 
+       if (ndctl_namespace_get_size(ndns) == 0)
+               return 1;
+
        ndctl_namespace_set_raw_mode(ndns, 1);
        rc = ndctl_namespace_enable(ndns);
        if (rc < 0) {
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