libcamera: base: shared_fd: Add comparison operators

Add == and != comparison operators between two SharedFD instances, and
use them to replace manuel get() calls.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

include/libcamera/base/shared_fd.h

@@ -46,4 +46,14 @@ private:
 	std::shared_ptr<Descriptor> fd_;
 };
 
+static inline bool operator==(const SharedFD &lhs, const SharedFD &rhs)
+{
+	return lhs.get() == rhs.get();
+}
+
+static inline bool operator!=(const SharedFD &lhs, const SharedFD &rhs)
+{
+	return !(lhs == rhs);
+}
+
 } /* namespace libcamera */