Initialize pointer arrays which may be freed before being initialized.

git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@29017 b3059339-0415-0410-9bf9-f77b7e298cf2

swscale-example.c

@@ -51,9 +51,9 @@ static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, i
 // ref & out are YV12
 static int doTest(uint8_t *ref[4], int refStride[4], int w, int h, int srcFormat, int dstFormat,
                   int srcW, int srcH, int dstW, int dstH, int flags){
-    uint8_t *src[4];
-    uint8_t *dst[4];
-    uint8_t *out[4];
+    uint8_t *src[4] = {0};
+    uint8_t *dst[4] = {0};
+    uint8_t *out[4] = {0};
     int srcStride[4], dstStride[4];
     int i;
     uint64_t ssdY, ssdU, ssdV, ssdA=0;