drm/nouveau/gsp: remove extraneous ; after mutex

The mutex field has two following semicolons, replace this with just
one semicolon.

Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Danilo Krummrich <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

drivers/gpu/drm/nouveau/include/nvkm/subdev/gsp.h

@@ -210,7 +210,7 @@ struct nvkm_gsp {
 	} *rm;
 
 	struct {
-		struct mutex mutex;;
+		struct mutex mutex;
 		struct idr idr;
 	} client_id;