nv04-nv40: fix nv##_surface_copy() for flipped

If do_flipp is true, it would first do the proper copy, height would
wrap around to unsigned maximum, and then it attempts to do another
copy.

Return after doing the proper copy.

Signed-off-by: Pekka Paalanen <pq@iki.fi>

src/gallium/drivers/nv04/nv04_surface.c

@@ -47,6 +47,7 @@ nv04_surface_copy(struct pipe_context *pipe, boolean do_flip,
 			eng2d->copy(eng2d, dest, destx, desty--, src,
 				    srcx, srcy++, width, 1);
 		}
+		return;
 	}
 
 	eng2d->copy(eng2d, dest, destx, desty, src, srcx, srcy, width, height);

src/gallium/drivers/nv10/nv10_surface.c

@@ -47,6 +47,7 @@ nv10_surface_copy(struct pipe_context *pipe, boolean do_flip,
 			eng2d->copy(eng2d, dest, destx, desty--, src,
 				    srcx, srcy++, width, 1);
 		}
+		return;
 	}
 
 	eng2d->copy(eng2d, dest, destx, desty, src, srcx, srcy, width, height);

src/gallium/drivers/nv20/nv20_surface.c

@@ -47,6 +47,7 @@ nv20_surface_copy(struct pipe_context *pipe, boolean do_flip,
 			eng2d->copy(eng2d, dest, destx, desty--, src,
 				    srcx, srcy++, width, 1);
 		}
+		return;
 	}
 
 	eng2d->copy(eng2d, dest, destx, desty, src, srcx, srcy, width, height);

src/gallium/drivers/nv30/nv30_surface.c

@@ -47,6 +47,7 @@ nv30_surface_copy(struct pipe_context *pipe, boolean do_flip,
 			eng2d->copy(eng2d, dest, destx, desty--, src,
 				    srcx, srcy++, width, 1);
 		}
+		return;
 	}
 
 	eng2d->copy(eng2d, dest, destx, desty, src, srcx, srcy, width, height);

src/gallium/drivers/nv40/nv40_surface.c

@@ -47,6 +47,7 @@ nv40_surface_copy(struct pipe_context *pipe, boolean do_flip,
 			eng2d->copy(eng2d, dest, destx, desty--, src,
 				    srcx, srcy++, width, 1);
 		}
+		return;
 	}
 
 	eng2d->copy(eng2d, dest, destx, desty, src, srcx, srcy, width, height);