ndtest: fix typo class_regster -> class_register

Fixes: dd6cad2dcb58 ("testing: nvdimm: make struct class structures constant")
Signed-off-by: Yi Zhang <[e-mail]>
Reviewed-by: Dave Jiang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

tools/testing/nvdimm/test/ndtest.c

···
 
 	nfit_test_setup(ndtest_resource_lookup, NULL);
 
-	rc = class_regster(&ndtest_dimm_class);
+	rc = class_register(&ndtest_dimm_class);
 	if (rc)
 		goto err_register;