Fix clang -Wextra except -Wunused-parameter.

Cleared all warnings that occur when passing
CFLAGS="-Wall -Wextra -Wno-unused-parameter" to make using clang 3.3 on
Linux x86-64.

i3-nagbar/main.c

@@ -467,7 +467,7 @@ int main(int argc, char *argv[]) {
         uint32_t top_end_x;
         uint32_t bottom_start_x;
         uint32_t bottom_end_x;
-    } __attribute__((__packed__)) strut_partial = {0,};
+    } __attribute__((__packed__)) strut_partial = {};
 
     strut_partial.top = font.height + 6;
     strut_partial.top_start_x = 0;