Cast to proper type for format string.

Classes/Sync/WebDav/WebDavTransferManager.m

@@ -170,7 +170,7 @@ - (void)connectionDidFinishLoading:(NSURLConnection*)aConnection {
                 activeTransfer.errorText = [NSString stringWithFormat:@"404: File not found: %@", [[activeTransfer remoteUrl] path]];
                 break;
             default:
-                activeTransfer.errorText = [NSString stringWithFormat:@"%d: Unknown error for file: %@", activeTransfer.statusCode, [[activeTransfer remoteUrl] path]];
+                activeTransfer.errorText = [NSString stringWithFormat:@"%d: Unknown error for file: %@", (unsigned int)activeTransfer.statusCode, [[activeTransfer remoteUrl] path]];
                 break;
         }
         activeTransfer.success = false;