drm/amd/display: Fix multiple memory leaks reported by coverity

coccinelle patch used:

@@ expression enc1,vpg,afmt; @@
-       if (!enc1 || !vpg || !afmt)
+       if (!enc1 || !vpg || !afmt) {
+               kfree(enc1);
+               kfree(vpg);
+               kfree(afmt);
                return NULL;
+       }

Addresses-Coverity-ID: 1466017: ("Resource leaks")

Reviewed-by: Aurabindo Jayamohanan Pillai <Aurabindo.Pillai@amd.com>
Acked-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c

@@ -1164,8 +1164,12 @@ struct stream_encoder *dcn30_stream_encoder_create(
 	vpg = dcn30_vpg_create(ctx, vpg_inst);
 	afmt = dcn30_afmt_create(ctx, afmt_inst);
 
-	if (!enc1 || !vpg || !afmt)
+	if (!enc1 || !vpg || !afmt) {
+		kfree(enc1);
+		kfree(vpg);
+		kfree(afmt);
 		return NULL;
+	}
 
 	dcn30_dio_stream_encoder_construct(enc1, ctx, ctx->dc_bios,
 					eng_id, vpg, afmt,

drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c

@@ -1195,8 +1195,12 @@ struct stream_encoder *dcn301_stream_encoder_create(
 	vpg = dcn301_vpg_create(ctx, vpg_inst);
 	afmt = dcn301_afmt_create(ctx, afmt_inst);
 
-	if (!enc1 || !vpg || !afmt)
+	if (!enc1 || !vpg || !afmt) {
+		kfree(enc1);
+		kfree(vpg);
+		kfree(afmt);
 		return NULL;
+	}
 
 	dcn30_dio_stream_encoder_construct(enc1, ctx, ctx->dc_bios,
 					eng_id, vpg, afmt,

drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c

@@ -542,8 +542,12 @@ static struct stream_encoder *dcn302_stream_encoder_create(enum engine_id eng_id
 	vpg = dcn302_vpg_create(ctx, vpg_inst);
 	afmt = dcn302_afmt_create(ctx, afmt_inst);
 
-	if (!enc1 || !vpg || !afmt)
+	if (!enc1 || !vpg || !afmt) {
+		kfree(enc1);
+		kfree(vpg);
+		kfree(afmt);
 		return NULL;
+	}
 
 	dcn30_dio_stream_encoder_construct(enc1, ctx, ctx->dc_bios, eng_id, vpg, afmt, &stream_enc_regs[eng_id],
 			&se_shift, &se_mask);

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c

@@ -1366,8 +1366,12 @@ static struct stream_encoder *dcn31_stream_encoder_create(
 	vpg = dcn31_vpg_create(ctx, vpg_inst);
 	afmt = dcn31_afmt_create(ctx, afmt_inst);
 
-	if (!enc1 || !vpg || !afmt)
+	if (!enc1 || !vpg || !afmt) {
+		kfree(enc1);
+		kfree(vpg);
+		kfree(afmt);
 		return NULL;
+	}
 
 	dcn30_dio_stream_encoder_construct(enc1, ctx, ctx->dc_bios,
 					eng_id, vpg, afmt,
@@ -1412,8 +1416,12 @@ static struct hpo_dp_stream_encoder *dcn31_hpo_dp_stream_encoder_create(
 	vpg = dcn31_vpg_create(ctx, vpg_inst);
 	apg = dcn31_apg_create(ctx, apg_inst);
 
-	if (!hpo_dp_enc31 || !vpg || !apg)
+	if (!hpo_dp_enc31 || !vpg || !apg) {
+		kfree(hpo_dp_enc31);
+		kfree(vpg);
+		kfree(apg);
 		return NULL;
+	}
 
 	dcn31_hpo_dp_stream_encoder_construct(hpo_dp_enc31, ctx, ctx->dc_bios,
 					hpo_dp_inst, eng_id, vpg, apg,