swscale: fix types of assembly arguments.

This prevents the following compiler warnings: "warning:
initialization from incompatible pointer type". Since the
variables are only ever used in inline assembly, their type
is actually irrelevant (so the part where it was wrong did
not invoke any buggy behaviour).

libswscale/x86/swscale_template.c

@@ -178,7 +178,7 @@ static inline void RENAME(yuv2yuv1)(SwsContext *c, const int16_t *lumSrc,
                                     uint8_t *aDest, int dstW, int chrDstW)
 {
     int p= 4;
-    const uint8_t *src[4]= { alpSrc + dstW, lumSrc + dstW, chrUSrc + chrDstW, chrVSrc + chrDstW };
+    const int16_t *src[4]= { alpSrc + dstW, lumSrc + dstW, chrUSrc + chrDstW, chrVSrc + chrDstW };
     uint8_t *dst[4]= { aDest, dest, uDest, vDest };
     x86_reg counter[4]= { dstW, dstW, chrDstW, chrDstW };
 
@@ -211,7 +211,7 @@ static inline void RENAME(yuv2yuv1_ar)(SwsContext *c, const int16_t *lumSrc,
                                        uint8_t *aDest, int dstW, int chrDstW)
 {
     int p= 4;
-    const uint8_t *src[4]= { alpSrc + dstW, lumSrc + dstW, chrUSrc + chrDstW, chrVSrc + chrDstW };
+    const int16_t *src[4]= { alpSrc + dstW, lumSrc + dstW, chrUSrc + chrDstW, chrVSrc + chrDstW };
     uint8_t *dst[4]= { aDest, dest, uDest, vDest };
     x86_reg counter[4]= { dstW, dstW, chrDstW, chrDstW };
 
@@ -2046,7 +2046,7 @@ static inline void RENAME(hyscale_fast)(SwsContext *c, int16_t *dst,
                                         int dstWidth, const uint8_t *src, int srcW,
                                         int xInc)
 {
-    int32_t *filterPos = c->hLumFilterPos;
+    int16_t *filterPos = c->hLumFilterPos;
     int16_t *filter    = c->hLumFilter;
     void    *mmx2FilterCode= c->lumMmx2FilterCode;
     int i;
@@ -2118,7 +2118,7 @@ static inline void RENAME(hcscale_fast)(SwsContext *c, int16_t *dst1, int16_t *d
                                         int dstWidth, const uint8_t *src1,
                                         const uint8_t *src2, int srcW, int xInc)
 {
-    int32_t *filterPos = c->hChrFilterPos;
+    int16_t *filterPos = c->hChrFilterPos;
     int16_t *filter    = c->hChrFilter;
     void    *mmx2FilterCode= c->chrMmx2FilterCode;
     int i;