drm/amd/pm: use int type to store negative error codes

Use int instead of uint32_t for 'ret' variable to store negative error
codes or zero returned by other functions.

Storing the negative error codes in unsigned type, doesn't cause an issue
at runtime but can be confusing. Additionally, assigning negative error
codes to unsigned type may trigger a GCC warning when the -Wsign-conversion
flag is enabled.

No effect on runtime.

Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: qianfengrong

drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.c

@@ -1032,7 +1032,7 @@ static int smu10_print_clock_levels(struct pp_hwmgr *hwmgr,
 			data->clock_vol_info.vdd_dep_on_fclk;
 	uint32_t i, now, size = 0;
 	uint32_t min_freq, max_freq = 0;
-	uint32_t ret = 0;
+	int ret = 0;
 
 	switch (type) {
 	case PP_SCLK:

drivers/gpu/drm/amd/pm/powerplay/smumgr/smu7_smumgr.c

@@ -401,7 +401,7 @@ int smu7_request_smu_load_fw(struct pp_hwmgr *hwmgr)
 int smu7_check_fw_load_finish(struct pp_hwmgr *hwmgr, uint32_t fw_type)
 {
 	struct smu7_smumgr *smu_data = (struct smu7_smumgr *)(hwmgr->smu_backend);
-	uint32_t ret;
+	int ret;
 
 	ret = phm_wait_on_indirect_register(hwmgr, mmSMC_IND_INDEX_11,
 					smu_data->soft_regs_start + smum_get_offsetof(hwmgr,

drivers/gpu/drm/amd/pm/swsmu/smu12/renoir_ppt.c

@@ -470,7 +470,7 @@ static int renoir_od_edit_dpm_table(struct smu_context *smu,
 static int renoir_set_fine_grain_gfx_freq_parameters(struct smu_context *smu)
 {
 	uint32_t min = 0, max = 0;
-	uint32_t ret = 0;
+	int ret = 0;
 
 	ret = smu_cmn_send_smc_msg_with_param(smu,
 								SMU_MSG_GetMinGfxclkFrequency,