Cleanup: Delete unnecessary pointer check from vdev_to_nvlist_iter()

This confused Clang's static analyzer, making it think there was a
possible NULL pointer dereference. There is no NULL pointer dereference.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes openzfs#14042

lib/libzfs/libzfs_pool.c

@@ -2677,7 +2677,7 @@ vdev_to_nvlist_iter(nvlist_t *nv, nvlist_t *search, boolean_t *avail_spare,
 			if (zfs_strcmp_pathname(srchval, val, wholedisk) == 0)
 				return (nv);
 
-		} else if (strcmp(srchkey, ZPOOL_CONFIG_TYPE) == 0 && val) {
+		} else if (strcmp(srchkey, ZPOOL_CONFIG_TYPE) == 0) {
 			char *type, *idx, *end, *p;
 			uint64_t id, vdev_id;