libzip: drop redundant get() calls

unique_ptr has an `operator bool`, so they are not needed.

plugins/libzipplugin/libzipplugin.cpp

@@ -675,9 +675,9 @@ bool LibzipPlugin::extractEntry(zip_t *archive, const QString &entry, const QStr
         // Handle password-protected files.
         std::unique_ptr<zip_file, decltype(&zip_fclose)> zipFile { nullptr, &zip_fclose };
         bool firstTry = true;
-        while (!zipFile.get()) {
+        while (!zipFile) {
             zipFile.reset(zip_fopen(archive, entry.toUtf8().constData(), 0));
-            if (zipFile.get()) {
+            if (zipFile) {
                 break;
             } else if (zip_error_code_zip(zip_get_error(archive)) == ZIP_ER_NOPASSWD ||
                        zip_error_code_zip(zip_get_error(archive)) == ZIP_ER_WRONGPASSWD) {