Fix uninitialized variable rgba

CONTRIBUTORS.md

@@ -7,6 +7,7 @@ video tutorials.
 
  - Bobyshev Alexander
  - Laurent Aphecetche
+ - Dimitris Apostolou
  - Matt Arsenault
  - Takuro Ashie
  - ashishgamedev

README.md

@@ -124,6 +124,7 @@ information on what to include when reporting a bug.
  - Added `GLFW_UNLIMITED_MOUSE_BUTTONS` input mode that allows mouse buttons beyond
    the limit of the mouse button tokens to be reported (#2423)
  - Updated minimum CMake version to 3.16 (#2541)
+ - Fixed uninitialized variable rgba
  - [Cocoa] Added `QuartzCore` framework as link-time dependency
  - [Cocoa] Removed support for OS X 10.10 Yosemite and earlier (#2506)
  - [Wayland] Bugfix: The fractional scaling related objects were not destroyed

examples/particles.c

@@ -487,6 +487,8 @@ static void draw_particles(GLFWwindow* window, double t, float dt)
             if (alpha > 1.f)
                 alpha = 1.f;
 
+            rgba = 0;
+
             // Convert color from float to 8-bit (store it in a 32-bit
             // integer using endian independent type casting)
             ((GLubyte*) &rgba)[0] = (GLubyte)(pptr->r * 255.f);