hevc: wait proper position for tmvp

The position is either rounded or not checked, so delay the wait to
check the proper value.
Reviewed-by: Mickaël Raulet <mraulet@insa-rennes.fr>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/hevc_mvs.c

@@ -237,14 +237,14 @@ static int temporal_luma_motion_vector(HEVCContext *s, int x0, int y0,
     x = x0 + nPbW;
     y = y0 + nPbH;
 
-    if (s->threads_type == FF_THREAD_FRAME )
-        ff_thread_await_progress(&ref->tf, y, 0);
     if (tab_mvf &&
         (y0 >> s->sps->log2_ctb_size) == (y >> s->sps->log2_ctb_size) &&
         y < s->sps->height &&
         x < s->sps->width) {
         x                 &= -16;
         y                 &= -16;
+        if (s->threads_type == FF_THREAD_FRAME)
+            ff_thread_await_progress(&ref->tf, y, 0);
         x_pu               = x >> s->sps->log2_min_pu_size;
         y_pu               = y >> s->sps->log2_min_pu_size;
         temp_col           = TAB_MVF(x_pu, y_pu);
@@ -257,6 +257,8 @@ static int temporal_luma_motion_vector(HEVCContext *s, int x0, int y0,
         y                  = y0 + (nPbH >> 1);
         x                 &= -16;
         y                 &= -16;
+        if (s->threads_type == FF_THREAD_FRAME)
+            ff_thread_await_progress(&ref->tf, y, 0);
         x_pu               = x >> s->sps->log2_min_pu_size;
         y_pu               = y >> s->sps->log2_min_pu_size;
         temp_col           = TAB_MVF(x_pu, y_pu);