gallium: Remove unused variables.

src/gallium/auxiliary/tgsi/tgsi_dump_c.c

@@ -646,7 +646,6 @@ tgsi_dump_c(
    struct tgsi_full_declaration fd;
    uint ignored = flags & TGSI_DUMP_C_IGNORED;
    uint deflt = flags & TGSI_DUMP_C_DEFAULT;
-   uint instno = 0;
 
    tgsi_parse_init( &parse, tokens );
 

src/gallium/drivers/softpipe/sp_quad_fs.c

@@ -171,7 +171,6 @@ static void shade_destroy(struct quad_stage *qs)
 struct quad_stage *sp_quad_shade_stage( struct softpipe_context *softpipe )
 {
    struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
-   uint i;
 
    /* allocate storage for program inputs/outputs, aligned to 16 bytes */
    qss->inputs = MALLOC(PIPE_MAX_ATTRIBS * sizeof(*qss->inputs) + 16);

src/mesa/state_tracker/st_framebuffer.c

@@ -170,7 +170,6 @@ st_set_framebuffer_surface(struct st_framebuffer *stfb,
                            uint surfIndex, struct pipe_surface *surf)
 {
    GET_CURRENT_CONTEXT(ctx);
-   struct st_context *st;
    static const GLuint invalid_size = 9999999;
    struct st_renderbuffer *strb;
    GLuint width, height, i;