lv-tool: Address Clang 17 warning -Wtautological-unsigned-enum-zero-compare

Author: hartwork

libvisual/tools/lv-tool/display/sdl_driver.cpp

@@ -117,7 +117,7 @@ namespace {
                   for (unsigned int i = VISUAL_GL_ATTRIBUTE_NONE; i < VISUAL_GL_ATTRIBUTE_LAST; i++) {
                       SDL_GLattr sdl_attribute = sdl_gl_attribute_map[vidoptions->gl_attrs[i].attribute];
 
-                      if (sdl_attribute < 0) {
+                      if (sdl_attribute == static_cast<SDL_GLattr> (-1)) {
                           continue;
                       }
 

libvisual/tools/lv-tool/display/stdout_sdl_driver.cpp

@@ -131,7 +131,7 @@ namespace {
                       SDL_GLattr sdl_attribute =
                           sdl_gl_attribute_map[vidoptions->gl_attrs[i].attribute];
 
-                      if (sdl_attribute < 0) {
+                      if (sdl_attribute == static_cast<SDL_GLattr> (-1)) {
                           continue;
                       }