Fix order of error checks in glfwSetGammaRamp

Initialization should be checked before arguments.

(cherry picked from commit 29523dbfbf)

src/monitor.c

@@ -521,6 +521,8 @@ GLFWAPI void glfwSetGammaRamp(GLFWmonitor* handle, const GLFWgammaramp* ramp)
     assert(ramp->green != NULL);
     assert(ramp->blue != NULL);
 
+    _GLFW_REQUIRE_INIT();
+
     if (ramp->size <= 0)
     {
         _glfwInputError(GLFW_INVALID_VALUE,
@@ -529,8 +531,6 @@ GLFWAPI void glfwSetGammaRamp(GLFWmonitor* handle, const GLFWgammaramp* ramp)
         return;
     }
 
-    _GLFW_REQUIRE_INIT();
-
     if (!monitor->originalRamp.size)
     {
         if (!_glfwPlatformGetGammaRamp(monitor, &monitor->originalRamp))