macintosh/windfarm_pm81: Fix warning comparing pointer to 0

Avoid pointer type value compared with 0 to make code clear.
Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1647484359-12402-1-git-send-email-baihaowen@meizu.com

drivers/macintosh/windfarm_pm81.c

@@ -401,7 +401,7 @@ static void wf_smu_create_cpu_fans(void)
 
 	/* First, locate the PID params in SMU SBD */
 	hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
-	if (hdr == 0) {
+	if (!hdr) {
 		printk(KERN_WARNING "windfarm: CPU PID fan config not found "
 		       "max fan speed\n");
 		goto fail;
@@ -705,7 +705,7 @@ static int wf_init_pm(void)
 	const struct smu_sdbp_header *hdr;
 
 	hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
-	if (hdr != 0) {
+	if (hdr) {
 		struct smu_sdbp_sensortree *st =
 			(struct smu_sdbp_sensortree *)&hdr[1];
 		wf_smu_mach_model = st->model_id;