Remove need for style_set boolean

Author: joto

src/command-line-parser.cpp

@@ -617,7 +617,6 @@ options_t parse_command_line(int argc, char *argv[])
             break;
         case 'S': // --style
             options.style = optarg;
-            options.style_set = true;
             break;
         case 'i': // --tablespace-index
             options.tblsmain_index = optarg;

src/options.hpp

@@ -164,7 +164,6 @@ struct options_t
     bool pass_prompt = false;
 
     bool output_backend_set = false;
-    bool style_set = false;
 }; // struct options_t
 
 #endif // OSM2PGSQL_OPTIONS_HPP

src/osm2pgsql.cpp

@@ -336,7 +336,7 @@ static void check_for_nodes_table(options_t const &options)
 
 static void check_and_set_style(options_t *options)
 {
-    if (!options->style_set) {
+    if (options->style.empty()) {
         if (options->output_backend == "flex" ||
             options->output_backend == "gazetteer") {
             throw std::runtime_error{"You have to set the config file "