Merge pull request #128 from miconda/master

Get rid of compile warning for clang and added tags/vim swap files to git ignore

.gitignore

@@ -30,3 +30,11 @@ test-driver
 
 # Ignore Doxygen generated files
 doc/html
+
+# Tags file
+tags
+TAGS
+
+# Vim swap files
+.*.swp
+.*.swo

src/setting.c

@@ -191,7 +191,7 @@ int
 setting_has_value(int id, const char *value)
 {
     setting_t *sett = setting_by_id(id);
-    if (sett && sett->value) {
+    if (sett) {
         return !strcmp(sett->value, value);
     }