mod_power_domain/unit_test: fix compiler error

On gcc 13.2.0 the following error is flagged:
error: comparison of integer expressions of different signedness:
‘int’ and ‘enum pd_idx’ [-Werror=sign-compare]

Positive enum should be compared against unsigned variables.

Signed-off-by: Tarek El-Sherbiny <tarek.el-sherbiny@arm.com>

module/power_domain/test/mod_power_domain_state_checks_unit_test.c

@@ -50,15 +50,15 @@ static void init_module_ctx(void)
     mod_pd_ctx_temp.system_pd_ctx =
         &mod_pd_ctx_temp.pd_ctx_table[PD_IDX_COUNT - 1];
 
-    for (int i = 0; i < PD_IDX_COUNT; ++i) {
+    for (unsigned int i = 0; i < PD_IDX_COUNT; ++i) {
         pd_ctx[i] = pd_ctx_config[i];
         fwk_list_init(&pd_ctx[i].children_list);
     }
 }
 
 static void evaluate_valid_state_mask(void)
 {
-    for (int i = 0; i < PD_IDX_COUNT; ++i) {
+    for (unsigned int i = 0; i < PD_IDX_COUNT; ++i) {
         for (unsigned int state = 0;
              state < pd_ctx[i].allowed_state_mask_table_size;
              state++) {
@@ -439,7 +439,7 @@ void test_is_upwards_transition_propagation_true(void)
     pd->cs_support = true;
 
     /* Change the current requested state so a deeper one can be requested */
-    for (int i = 0; i < PD_IDX_COUNT; ++i) {
+    for (unsigned int i = 0; i < PD_IDX_COUNT; ++i) {
         pd_ctx[i].requested_state = MOD_PD_STATE_ON;
     }
 
@@ -472,7 +472,7 @@ void test_is_upwards_transition_propagation_no_cs_true(void)
     pd->cs_support = false;
 
     /* Swap this round so a deeper state can be requested */
-    for (int i = 0; i < PD_IDX_COUNT; ++i) {
+    for (unsigned int i = 0; i < PD_IDX_COUNT; ++i) {
         pd_ctx[i].requested_state = MOD_PD_STATE_ON;
     }
 
@@ -507,7 +507,7 @@ void test_is_allowed_by_parent_and_children_denied(void)
     struct pd_ctx *pd = &mod_pd_ctx_temp.pd_ctx_table[PD_IDX_CLUSTER0];
 
     /* Swap this round so a pd can deny it is permitted */
-    for (int i = 0; i < PD_IDX_COUNT; ++i) {
+    for (unsigned int i = 0; i < PD_IDX_COUNT; ++i) {
         pd_ctx[i].current_state = MOD_PD_STATE_ON;
     }
 

module/power_domain/test/mod_power_domain_unit_test.c

@@ -41,7 +41,7 @@ static void init_module_ctx(void)
     mod_pd_ctx.pd_count = PD_IDX_COUNT;
     mod_pd_ctx.system_pd_ctx = &mod_pd_ctx.pd_ctx_table[PD_IDX_COUNT - 1];
 
-    for (int i = 0; i < PD_IDX_COUNT; ++i) {
+    for (unsigned int i = 0; i < PD_IDX_COUNT; ++i) {
         pd_ctx[i] = pd_ctx_config[i];
         pd_ctx[i].driver_api = &pd_driver;
         fwk_list_init(&pd_ctx[i].children_list);
@@ -50,7 +50,7 @@ static void init_module_ctx(void)
 
 static void evaluate_valid_state_mask(void)
 {
-    for (int i = 0; i < PD_IDX_COUNT; ++i) {
+    for (unsigned int i = 0; i < PD_IDX_COUNT; ++i) {
         for (unsigned int state = 0;
              state < pd_ctx[i].allowed_state_mask_table_size;
              state++) {
@@ -812,7 +812,7 @@ void test_process_get_state_request_cs(void)
     pd_ctx[PD_IDX_CLUS0CORE0].composite_state_levels_mask = MOD_PD_CS_STATE_MASK
         << MOD_PD_CS_LEVEL_SHIFT;
 
-    for (int i = 0; i < PD_IDX_COUNT; ++i) {
+    for (unsigned int i = 0; i < PD_IDX_COUNT; ++i) {
         pd_ctx[i].current_state = MOD_PD_STATE_ON;
     }