rv30: fix masking in rv30_loop_filter()

The mask `x && (1 << y)' is incorrect and always yields true.

The correct form should be `x & (1 << y)'.

CC: libav-stable@libav.org
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/rv30.c

@@ -182,7 +182,7 @@ static void rv30_loop_filter(RV34DecContext *r, int row)
                 for(i = !mb_x; i < 2; i++, C += 4){
                     int ij = i + (j >> 1);
                     loc_lim = 0;
-                    if(cur_cbp && (1 << ij))
+                    if (cur_cbp & (1 << ij))
                         loc_lim = cur_lim;
                     else if(!i && left_cbp & (1 << (ij + 1)))
                         loc_lim = left_lim;
@@ -224,7 +224,7 @@ static void rv30_loop_filter(RV34DecContext *r, int row)
                 for(i = 0; i < 2; i++, C += 4){
                     int ij = i + (j >> 1);
                     loc_lim = 0;
-                    if(r->cbp_chroma[mb_pos] && (1 << ij))
+                    if (r->cbp_chroma[mb_pos] & (1 << ij))
                         loc_lim = cur_lim;
                     else if(!j && top_cbp & (1 << (ij + 2)))
                         loc_lim = top_lim;