Fixes these GCC warnings.
u_vbuf.c: In function ‘u_vbuf_draw_begin’:
u_vbuf.c:839:20: warning: ‘max_index’ may be used uninitialized in this 
function [-Wuninitialized]
u_vbuf.c:838:20: warning: ‘min_index’ may be used uninitialized in this 
function [-Wuninitialized]

Signed-off-by: Vinson Lee <[email protected]>
---
 src/gallium/auxiliary/util/u_vbuf.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_vbuf.c 
b/src/gallium/auxiliary/util/u_vbuf.c
index f6da912..5b0e26e 100644
--- a/src/gallium/auxiliary/util/u_vbuf.c
+++ b/src/gallium/auxiliary/util/u_vbuf.c
@@ -808,6 +808,8 @@ static void u_vbuf_get_minmax_index(struct pipe_context 
*pipe,
    }
    default:
       assert(0);
+      *out_min_index = 0;
+      *out_max_index = 0;
    }
 
    if (transfer) {
-- 
1.7.7.3

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