fix(xilinx): check proc variable before use

Check return value from pm_get_proc() to make sure that CPU is valid.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Change-Id: If51b5d42ce87f31fd732ab58ae8fcd0e2db0a2a8
diff --git a/plat/xilinx/versal_net/plat_psci_pm.c b/plat/xilinx/versal_net/plat_psci_pm.c
index 94cb7f5..7260403 100644
--- a/plat/xilinx/versal_net/plat_psci_pm.c
+++ b/plat/xilinx/versal_net/plat_psci_pm.c
@@ -63,6 +63,10 @@
 	uint32_t cpu_id = plat_my_core_pos();
 	const struct pm_proc *proc = pm_get_proc(cpu_id);
 
+	if (!proc) {
+		return;
+	}
+
 	for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) {
 		VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n",
 			__func__, i, target_state->pwr_domain_state[i]);
@@ -143,6 +147,10 @@
 	uint32_t cpu_id = plat_my_core_pos();
 	const struct pm_proc *proc = pm_get_proc(cpu_id);
 
+	if (!proc) {
+		return;
+	}
+
 	for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) {
 		VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n",
 			__func__, i, target_state->pwr_domain_state[i]);
@@ -186,6 +194,10 @@
 	uint32_t cpu_id = plat_my_core_pos();
 	const struct pm_proc *proc = pm_get_proc(cpu_id);
 
+	if (!proc) {
+		return;
+	}
+
 	for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++)
 		VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n",
 			__func__, i, target_state->pwr_domain_state[i]);