avutil/softfloat_ieee754: Fix odd bit position for exponent and sign in av_bits2sf_ieee754()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 82e389d066)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavutil/softfloat_ieee754.h

@@ -64,7 +64,7 @@ static inline SoftFloat_IEEE754 av_int2sf_ieee754(int64_t n, int e) {
  *  by the IEEE 754 spec.
  */
 static inline SoftFloat_IEEE754 av_bits2sf_ieee754(uint32_t n) {
-    return ((SoftFloat_IEEE754) { (n & 0x80000000UL), (n & 0x7FFFFFUL), (n & 0x7F800000UL) });
+    return ((SoftFloat_IEEE754) { (n & 0x80000000UL) >> 31, (n & 0x7FFFFFUL), (int8_t)((n & 0x7F800000UL) >> 23)});
 }
 
 /** Convert the softfloat to integer