Win32: Fix VS static analysis false positive

This way is perhaps also more readable for humans.

src/win32_monitor.c

@@ -477,7 +477,7 @@ void _glfwPlatformGetVideoMode(_GLFWmonitor* monitor, GLFWvidmode* mode)
 GLFWbool _glfwPlatformGetGammaRamp(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
 {
     HDC dc;
-    WORD values[768];
+    WORD values[3][256];
 
     dc = CreateDCW(L"DISPLAY", monitor->win32.adapterName, NULL, NULL);
     GetDeviceGammaRamp(dc, values);
@@ -485,9 +485,9 @@ GLFWbool _glfwPlatformGetGammaRamp(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
 
     _glfwAllocGammaArrays(ramp, 256);
 
-    memcpy(ramp->red,   values +   0, 256 * sizeof(unsigned short));
-    memcpy(ramp->green, values + 256, 256 * sizeof(unsigned short));
-    memcpy(ramp->blue,  values + 512, 256 * sizeof(unsigned short));
+    memcpy(ramp->red,   values[0], sizeof(values[0]));
+    memcpy(ramp->green, values[1], sizeof(values[1]));
+    memcpy(ramp->blue,  values[2], sizeof(values[2]));
 
     return GLFW_TRUE;
 }
@@ -495,7 +495,7 @@ GLFWbool _glfwPlatformGetGammaRamp(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
 void _glfwPlatformSetGammaRamp(_GLFWmonitor* monitor, const GLFWgammaramp* ramp)
 {
     HDC dc;
-    WORD values[768];
+    WORD values[3][256];
 
     if (ramp->size != 256)
     {
@@ -504,9 +504,9 @@ void _glfwPlatformSetGammaRamp(_GLFWmonitor* monitor, const GLFWgammaramp* ramp)
         return;
     }
 
-    memcpy(values +   0, ramp->red,   256 * sizeof(unsigned short));
-    memcpy(values + 256, ramp->green, 256 * sizeof(unsigned short));
-    memcpy(values + 512, ramp->blue,  256 * sizeof(unsigned short));
+    memcpy(values[0], ramp->red,   sizeof(values[0]));
+    memcpy(values[1], ramp->green, sizeof(values[1]));
+    memcpy(values[2], ramp->blue,  sizeof(values[2]));
 
     dc = CreateDCW(L"DISPLAY", monitor->win32.adapterName, NULL, NULL);
     SetDeviceGammaRamp(dc, values);