Fixing double init value

Source/BasicMathFunctions/arm_dot_prod_f64.c

@@ -66,7 +66,7 @@ void arm_dot_prod_f64(
         float64_t * result)
 {
   uint32_t blkCnt;                               /* Loop counter */
-  float64_t sum = 0.0f;                          /* Temporary return variable */
+  float64_t sum = 0.;                            /* Temporary return variable */
 
   /* Initialize blkCnt with number of samples */
   blkCnt = blockSize;