fix: Replace C-style casts with C++ casts

This commit addresses cppcheck warnings about C-style casts (cstyleCast)
by replacing them with appropriate C++ casts. C-style casts are considered
dangerous because they can perform unsafe conversions without compile-time
type checking, while C++ casts are more explicit and type-safe.

Changes made:
- static_cast for safe type conversions (e.g., void* to struct*)
- reinterpret_cast for pointer type conversions (e.g., uint8_t* to char*)
- Combined static_cast and reinterpret_cast for integer-to-pointer conversions

Fixed files:
- kmscube/cube-gles2.cpp: GLvoid* casts for OpenGL vertex attribute pointers
- kmscube/cube-wl.cpp: Wayland interface pointer casts
- kmscube/cube-x11.cpp: X11 window handle conversion
- utils/fbtest.cpp: mmap return value cast
- utils/kmstest.cpp: Framebuffer pointer arithmetic
- utils/kmsview.cpp: Framebuffer memory mapping cast

1 files changed, 3 insertions, 3 deletions

diff --git a/kmscube/cube-gles2.cpp b/kmscube/cube-gles2.cpp
index 854c90e..0e52a32 100644
--- a/kmscube/cube-gles2.cpp
+++ b/kmscube/cube-gles2.cpp
@@ -200,11 +200,11 @@ GlScene::GlScene()
 	glBufferSubData(GL_ARRAY_BUFFER, positionsoffset, sizeof(vVertices), &vVertices[0]);
 	glBufferSubData(GL_ARRAY_BUFFER, colorsoffset, sizeof(vColors), &vColors[0]);
 	glBufferSubData(GL_ARRAY_BUFFER, normalsoffset, sizeof(vNormals), &vNormals[0]);
-	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid*)positionsoffset);
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, reinterpret_cast<const GLvoid*>(positionsoffset));
 	glEnableVertexAttribArray(0);
-	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid*)normalsoffset);
+	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, reinterpret_cast<const GLvoid*>(normalsoffset));
 	glEnableVertexAttribArray(1);
-	glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid*)colorsoffset);
+	glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 0, reinterpret_cast<const GLvoid*>(colorsoffset));
 	glEnableVertexAttribArray(2);
 }