hv: coding style: refine hcall_initialize_trusty to one exit

Fix procedure has more than one exit point.

Tracked-On: #2120
Signed-off-by: Li, Fei1 <fei1.li@intel.com>

Author: lifeix

hypervisor/common/trusty_hypercall.c

@@ -66,32 +66,26 @@ int32_t hcall_world_switch(struct acrn_vcpu *vcpu)
  */
 int32_t hcall_initialize_trusty(struct acrn_vcpu *vcpu, uint64_t param)
 {
-	if (vcpu->vm->sworld_control.flag.supported == 0UL) {
-		dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
-			"Secure World is not supported!\n");
-		return -EPERM;
-	}
-
-	if (vcpu->vm->sworld_control.flag.active != 0UL) {
-		dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
-			"Trusty already initialized!\n");
-		return -EPERM;
-	}
+	int32_t ret = 0;
 
-	if (vcpu->arch.cur_context != NORMAL_WORLD) {
-		dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
-			"%s, must initialize Trusty from Normal World!\n",
-			__func__);
-		return -EPERM;
-	}
-
-	if (!initialize_trusty(vcpu, param)) {
-		return -ENODEV;
+	if (vcpu->vm->sworld_control.flag.supported == 0UL) {
+		pr_err("Secure World is not supported!\n");
+		ret = -EPERM;
+	} else if (vcpu->vm->sworld_control.flag.active != 0UL) {
+		pr_err("Trusty already initialized!\n");
+		ret = -EPERM;
+	} else if (vcpu->arch.cur_context != NORMAL_WORLD) {
+		pr_err("%s, must initialize Trusty from Normal World!\n", __func__);
+		ret = -EPERM;
+	} else {
+		if (!initialize_trusty(vcpu, param)) {
+			ret = -ENODEV;
+		} else {
+			vcpu->vm->sworld_control.flag.active = 1UL;
+		}
 	}
 
-	vcpu->vm->sworld_control.flag.active = 1UL;
-
-	return 0;
+	return ret;
 }
 
 /**