libcamera: software_isp: Replace malloc() with std::vector<>

libcamera is implemented in C++, use std::vector<> to manage the
dynamically allocated line buffers instead of malloc() and free(). This
simplifies the code and improves memory safety by ensuring no allocation
will be leaked.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>

src/libcamera/software_isp/debayer_cpu.h

@@ -146,7 +146,7 @@ private:
 	DebayerInputConfig inputConfig_;
 	DebayerOutputConfig outputConfig_;
 	std::unique_ptr<SwStatsCpu> stats_;
-	uint8_t *lineBuffers_[kMaxLineBuffers];
+	std::vector<uint8_t> lineBuffers_[kMaxLineBuffers];
 	unsigned int lineBufferLength_;
 	unsigned int lineBufferPadding_;
 	unsigned int lineBufferIndex_;