storage_util: Move secretPath generation

Move generation of secretPath to storageBackendGenerateSecretData
and simplify a bit since we know vol->target.encryption is set plus
we have a local @enc.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

src/storage/storage_util.c

@@ -1310,7 +1310,9 @@ storageBackendCreateQemuImgSecretPath(virStoragePoolObjPtr pool,
 
 
 static int
-storageBackendGenerateSecretData(virStorageVolDefPtr vol)
+storageBackendGenerateSecretData(virStoragePoolObjPtr pool,
+                                 virStorageVolDefPtr vol,
+                                 char **secretPath)
 {
     virStorageEncryptionPtr enc = vol->target.encryption;
 
@@ -1325,6 +1327,12 @@ storageBackendGenerateSecretData(virStorageVolDefPtr vol)
             return -1;
     }
 
+    if (vol->target.format == VIR_STORAGE_FILE_RAW &&
+        enc->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
+        if (!(*secretPath = storageBackendCreateQemuImgSecretPath(pool, vol)))
+            return -1;
+    }
+
     return 0;
 }
 
@@ -1350,17 +1358,9 @@ storageBackendCreateQemuImg(virStoragePoolObjPtr pool,
         return -1;
     }
 
-    if (storageBackendGenerateSecretData(vol) < 0)
+    if (storageBackendGenerateSecretData(pool, vol, &secretPath) < 0)
         goto cleanup;
 
-    if (vol->target.format == VIR_STORAGE_FILE_RAW &&
-        vol->target.encryption &&
-        vol->target.encryption->format == VIR_STORAGE_ENCRYPTION_FORMAT_LUKS) {
-        if (!(secretPath =
-              storageBackendCreateQemuImgSecretPath(pool, vol)))
-            goto cleanup;
-    }
-
     cmd = virStorageBackendCreateQemuImgCmdFromVol(pool, vol, inputvol,
                                                    flags, create_tool,
                                                    secretPath);