i965/fs: Add another use of MAX_VGRF_SIZE

Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
diff --git a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
index 65a09a0..be02dfe 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
@@ -102,7 +102,7 @@
     * regs).
     */
    int class_count;
-   int class_sizes[BRW_MAX_MRF];
+   int class_sizes[MAX_VGRF_SIZE];
 
    if (devinfo->gen >= 7) {
       for (class_count = 0; class_count < MAX_VGRF_SIZE; class_count++)