swr: properly report max number of SO components

The components count the number of individual values, not the number of
slots.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Tim Rowley <timothy.o.rowley@intel.com>

src/gallium/drivers/swr/swr_screen.cpp

@@ -166,7 +166,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
       return MAX_SO_STREAMS;
    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
-      return MAX_ATTRIBUTES;
+      return MAX_ATTRIBUTES * 4;
    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
       return 1024;