staging: fsl-mc: fix coding style warning

Fix for "WARNING: Avoid multiple line dereference - prefer
'mc_msi_domain->host_data'" found by checkpatch.pl in
bus/irq-gic-v3-its-fsl-mc-msi.c.
Signed-off-by: Lucian Zala <zala.lucian@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c

@@ -95,8 +95,8 @@ int __init its_fsl_mc_msi_init(void)
 			continue;
 		}
 
-		WARN_ON(mc_msi_domain->
-				host_data != &its_fsl_mc_msi_domain_info);
+		WARN_ON(mc_msi_domain->host_data !=
+			&its_fsl_mc_msi_domain_info);
 
 		pr_info("fsl-mc MSI: %s domain created\n", np->full_name);
 	}