util: replace qemu_get_local_state_pathname()

Simplify the function to only return the directory path. Callers are
adjusted to use the GLib function to build paths, g_build_filename().

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220420132624.2439741-39-marcandre.lureau@redhat.com>
diff --git a/scsi/qemu-pr-helper.c b/scsi/qemu-pr-helper.c
index df493e2..196b78c 100644
--- a/scsi/qemu-pr-helper.c
+++ b/scsi/qemu-pr-helper.c
@@ -77,8 +77,10 @@
 
 static void compute_default_paths(void)
 {
-    socket_path = qemu_get_local_state_pathname("run/qemu-pr-helper.sock");
-    pidfile = qemu_get_local_state_pathname("run/qemu-pr-helper.pid");
+    g_autofree char *state = qemu_get_local_state_dir();
+
+    socket_path = g_build_filename(state, "run", "qemu-pr-helper.sock", NULL);
+    pidfile = g_build_filename(state, "run", "qemu-pr-helper.pid", NULL);
 }
 
 static void usage(const char *name)