i965: Silence uninitialized variable warning.

Silences this GCC warning.
brw_wm_fp.c: In function 'brw_wm_pass_fp':
brw_wm_fp.c:966: warning: 'last_inst' may be used uninitialized in this function
brw_wm_fp.c:966: note: 'last_inst' was declared here

diff --git a/src/mesa/drivers/dri/i965/brw_wm_fp.c b/src/mesa/drivers/dri/i965/brw_wm_fp.c
index d69b836..2cae698 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_wm_fp.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_fp.c
@@ -963,7 +963,7 @@ static void emit_render_target_writes( struct brw_wm_compile *c )
    struct prog_src_register outcolor;
    GLuint i;
 
-   struct prog_instruction *inst, *last_inst;
+   struct prog_instruction *inst, *last_inst = NULL;
 
    /* The inst->Aux field is used for FB write target and the EOT marker */