nouveau: relax fence emit space assert

We also have the "reserved for kick" space available. Some of my earlier
changes can probably be removed, but this is a quick fix for some of the
rarer fallout.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: <mesa-stable@lists.freedesktop.org>

src/gallium/drivers/nouveau/nv30/nv30_screen.c

@@ -353,7 +353,7 @@ nv30_screen_fence_emit(struct pipe_screen *pscreen, uint32_t *sequence)
 
    *sequence = ++screen->base.fence.sequence;
 
-   assert(PUSH_AVAIL(push) >= 3);
+   assert(PUSH_AVAIL(push) + push->rsvd_kick >= 3);
    PUSH_DATA (push, NV30_3D_FENCE_OFFSET |
               (2 /* size */ << 18) | (7 /* subchan */ << 13));
    PUSH_DATA (push, 0);

src/gallium/drivers/nouveau/nv50/nv50_screen.c

@@ -392,7 +392,7 @@ nv50_screen_fence_emit(struct pipe_screen *pscreen, u32 *sequence)
    /* we need to do it after possible flush in MARK_RING */
    *sequence = ++screen->base.fence.sequence;
 
-   assert(PUSH_AVAIL(push) >= 5);
+   assert(PUSH_AVAIL(push) + push->rsvd_kick >= 5);
    PUSH_DATA (push, NV50_FIFO_PKHDR(NV50_3D(QUERY_ADDRESS_HIGH), 4));
    PUSH_DATAh(push, screen->fence.bo->offset);
    PUSH_DATA (push, screen->fence.bo->offset);

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -547,7 +547,7 @@ nvc0_screen_fence_emit(struct pipe_screen *pscreen, u32 *sequence)
    /* we need to do it after possible flush in MARK_RING */
    *sequence = ++screen->base.fence.sequence;
 
-   assert(PUSH_AVAIL(push) >= 5);
+   assert(PUSH_AVAIL(push) + push->rsvd_kick >= 5);
    PUSH_DATA (push, NVC0_FIFO_PKHDR_SQ(NVC0_3D(QUERY_ADDRESS_HIGH), 4));
    PUSH_DATAh(push, screen->fence.bo->offset);
    PUSH_DATA (push, screen->fence.bo->offset);