Manager: Use early-exit return style to decrease nesting

src/package.cpp

@@ -112,18 +112,17 @@ void Package::installOrAurInstall(InstallType type)
 
 	std::optional<std::string> aurHelper;
 	if (type == InstallType::AurInstall) {
-		if (m_distro == Distro::Arch) {
+		if (m_distro != Distro::Arch) {
+			fprintf(stderr, "\033[31;1mPackage:\033[0m AUR is not supported on this distribution\n");
+			return;
+		}
+
 		aurHelper = fetchAurHelper();
 		if (!aurHelper.has_value()) {
 			fprintf(stderr, "\033[31;1mPackage:\033[0m no supported AUR helper found\n");
 			return;
 		}
 	}
-		else {
-			fprintf(stderr, "\033[31;1mPackage:\033[0m AUR is not supported on this distribution\n");
-			return;
-		}
-	}
 
 	std::string command = "";