libcamera: process: start(): Use span instead of vector

Use a span instead of a const reference to a vector, this does not
change the behaviour and allows e.g. arrays to be used to hold
arguments/file descriptors.

Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/internal/process.h

@@ -9,10 +9,10 @@
 
 #include <signal.h>
 #include <string>
-#include <vector>
 
 #include <libcamera/base/class.h>
 #include <libcamera/base/signal.h>
+#include <libcamera/base/span.h>
 #include <libcamera/base/unique_fd.h>
 
 namespace libcamera {
@@ -32,8 +32,8 @@ public:
 	~Process();
 
 	int start(const std::string &path,
-		  const std::vector<std::string> &args = std::vector<std::string>(),
-		  const std::vector<int> &fds = std::vector<int>());
+		  Span<const std::string> args = {},
+		  Span<const int> fds = {});
 
 	ExitStatus exitStatus() const { return exitStatus_; }
 	int exitCode() const { return exitCode_; }