GL: Fixed memory corruption.

src/renderer_gl.cpp

@@ -548,7 +548,7 @@ namespace bgfx
 			{
 				GL_CHECK(glGenFramebuffers(1, &m_msaaBackBufferFbo) );
 				GL_CHECK(glBindFramebuffer(GL_FRAMEBUFFER, m_msaaBackBufferFbo) );
-				GL_CHECK(glGenRenderbuffers(3, m_msaaBackBufferRbos) );
+				GL_CHECK(glGenRenderbuffers(BX_COUNTOF(m_msaaBackBufferRbos), m_msaaBackBufferRbos) );
 				GL_CHECK(glBindRenderbuffer(GL_RENDERBUFFER, m_msaaBackBufferRbos[0]) );
 				GL_CHECK(glRenderbufferStorageMultisample(GL_RENDERBUFFER, _msaa, GL_RGBA8, _width, _height) );
 				GL_CHECK(glBindRenderbuffer(GL_RENDERBUFFER, m_msaaBackBufferRbos[1]) );
@@ -576,7 +576,7 @@ namespace bgfx
 			if (0 != m_msaaBackBufferFbo)
 			{
 				GL_CHECK(glDeleteFramebuffers(1, &m_msaaBackBufferFbo) );
-				GL_CHECK(glDeleteRenderbuffers(3, m_msaaBackBufferRbos) );
+				GL_CHECK(glDeleteRenderbuffers(BX_COUNTOF(m_msaaBackBufferRbos), m_msaaBackBufferRbos) );
 				m_msaaBackBufferFbo = 0;
 			}
 #endif // BGFX_CONFIG_RENDERER_OPENGL|BGFX_CONFIG_RENDERER_OPENGLES3