fix compiler warnings (GCC + Clang)

src/logic/scripting/lua/libs/libblock.cpp

@@ -145,7 +145,7 @@ static int get_axis(lua::State* L) {
     }
     auto z = lua::tointeger(L, 3);
 
-    glm::ivec3 defAxis;
+    glm::ivec3 defAxis {};
     defAxis[n] = 1;
 
     auto vox = blocks_agent::get(*level->chunks, x, y, z);
@@ -562,6 +562,7 @@ static int set_field(
                 return lua::pushinteger(L,
                     dataStruct.setUnicode(dst, value.asString(), field));
             }
+            [[fallthrough]];
         case data::FieldType::I8:
         case data::FieldType::I16:
         case data::FieldType::I32: