fix: mat4.decompose (-Wmaybe-uninitialized)

doc/en/scripting/builtins/libmat4.md

@@ -111,7 +111,7 @@ mat4.decompose(m: matrix)
     translation=vec3,
     skew=vec3,
     perspective=vec4
-}
+} or nil
 ```
 
 ## Look at point - *mat4.look_at(...)*

doc/ru/scripting/builtins/libmat4.md

@@ -111,7 +111,7 @@ mat4.decompose(m: matrix)
     translation=vec3,
     skew=vec3,
     perspective=vec4 
-}
+} или nil
 ```
 
 ## Отслеживание точки *mat4.look_at(...)*

src/logic/scripting/lua/libmat4.cpp

@@ -165,7 +165,7 @@ static int l_transpose(lua::State* L) {
 ///   translation=float[3],
 ///   skew=float[3],
 ///   perspective=float[4]
-/// }
+/// } or nil
 static int l_decompose(lua::State* L) {
     auto matrix = lua::tomat4(L, 1);
     glm::vec3 scale;
@@ -173,15 +173,14 @@ static int l_decompose(lua::State* L) {
     glm::vec3 translation;
     glm::vec3 skew;
     glm::vec4 perspective;
-    glm::decompose(
+    if (glm::decompose(
         matrix,
         scale,
         rotation,
         translation,
         skew,
         perspective
-    );
-
+    )) {
         lua::createtable(L, 0, 6);
         
         lua::pushvec3(L, scale);
@@ -203,6 +202,8 @@ static int l_decompose(lua::State* L) {
         lua::setfield(L, "perspective");
         return 1;
     }
+    return 0;
+}
 
 static int l_look_at(lua::State* L) {
     uint argc = lua::check_argc(L, 3, 4);