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, 2 insertions, 2 deletions

diff --git a/utils/fbtest.cpp b/utils/fbtest.cpp
index 913d773..4992895 100644
--- a/utils/fbtest.cpp
+++ b/utils/fbtest.cpp
@@ -33,10 +33,10 @@ int main(int argc, char** argv)
 	r = ioctl(fd, FBIOGET_FSCREENINFO, &fix);
 	FAIL_IF(r, "FBIOGET_FSCREENINFO failed");
 
-	uint8_t* ptr = (uint8_t*)mmap(NULL,
+	uint8_t* ptr = static_cast<uint8_t*>(mmap(NULL,
 				      var.yres_virtual * fix.line_length,
 				      PROT_WRITE | PROT_READ,
-				      MAP_SHARED, fd, 0);
+				      MAP_SHARED, fd, 0));
 
 	FAIL_IF(ptr == MAP_FAILED, "mmap failed");