Fix 9/10 bit in swscale.

Signed-off-by: NRonald S. Bultje <rsbultje@gmail.com>

libswscale/swscale.c

@@ -233,7 +233,7 @@ static av_always_inline void yuv2yuvX16inC_template(const int16_t *lumFilter, co
         } \
     }
     for (i = 0; i < dstW; i++) {
-        int val = 1 << 10;
+        int val = 1 << (26-output_bits);
         int j;
 
         for (j = 0; j < lumFilterSize; j++)
@@ -244,8 +244,8 @@ static av_always_inline void yuv2yuvX16inC_template(const int16_t *lumFilter, co
 
     if (uDest) {
         for (i = 0; i < chrDstW; i++) {
-            int u = 1 << 10;
-            int v = 1 << 10;
+            int u = 1 << (26-output_bits);
+            int v = 1 << (26-output_bits);
             int j;
 
             for (j = 0; j < chrFilterSize; j++) {
@@ -260,7 +260,7 @@ static av_always_inline void yuv2yuvX16inC_template(const int16_t *lumFilter, co
 
     if (CONFIG_SWSCALE_ALPHA && aDest) {
         for (i = 0; i < dstW; i++) {
-            int val = 1 << 10;
+            int val = 1 << (26-output_bits);
             int j;
 
             for (j = 0; j < lumFilterSize; j++)