Courtesy of clang static analyzer.

I was hunting for potential sources of memory corruption using Mesa with
a GL trace, and happened to find this (unrelated) issue.
---
 src/gallium/drivers/svga/svga_context.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/gallium/drivers/svga/svga_context.c 
b/src/gallium/drivers/svga/svga_context.c
index 546b9f48b1..af16a99b72 100644
--- a/src/gallium/drivers/svga/svga_context.c
+++ b/src/gallium/drivers/svga/svga_context.c
@@ -327,6 +327,7 @@ cleanup:
    util_bitmask_destroy(svga->stream_output_id_bm);
    util_bitmask_destroy(svga->query_id_bm);
    FREE(svga);
+   svga = NULL;
 
 done:
    SVGA_STATS_TIME_POP(svgascreen->sws);
-- 
2.14.1

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