Fix build error.

Signed-off-by: Dominic Fischer <dominicfischer7@gmail.com>

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/crypto/keysbackup/KeysBackup.kt

@@ -630,16 +630,14 @@ internal class KeysBackup @Inject constructor(
                     }
 
                     // Get a PK decryption instance
-                    val decryption = pkDecryptionFromRecoveryKey(recoveryKey)
+                    pkDecryptionFromRecoveryKey(recoveryKey)
+                }
                 if (decryption == null) {
                     // This should not happen anymore
                     Timber.e("restoreKeysWithRecoveryKey: Invalid recovery key. Error")
                     throw InvalidParameterException("Invalid recovery key")
                 }
 
-                    decryption
-                }
-
                 stepProgressListener?.onStepProgress(StepProgressListener.Step.DownloadingKey)
 
                 // Get backed up keys from the homeserver