swscale: fix mono input for width%8

Fixes ticket193
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswscale/swscale.c

@@ -1677,6 +1677,11 @@ static void monowhite2Y_c(int16_t *dst, const uint8_t *src, int width, uint32_t
         for(j=0; j<8; j++)
             dst[8*i+j]= ((d>>(7-j))&1)*16383;
     }
+    if(width&7){
+        int d= ~src[i];
+        for(j=0; j<(width&7); j++)
+            dst[8*i+j]= ((d>>(7-j))&1)*16383;
+    }
 }
 
 static void monoblack2Y_c(int16_t *dst, const uint8_t *src, int width, uint32_t *unused)
@@ -1687,6 +1692,11 @@ static void monoblack2Y_c(int16_t *dst, const uint8_t *src, int width, uint32_t
         for(j=0; j<8; j++)
             dst[8*i+j]= ((d>>(7-j))&1)*16383;
     }
+    if(width&7){
+        int d= src[i];
+        for(j=0; j<(width&7); j++)
+            dst[8*i+j]= ((d>>(7-j))&1)*16383;
+    }
 }
 
 //FIXME yuy2* can read up to 7 samples too much