do saturated math properly (thanks to the eagle-eyes of Tony Mountifield)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6888 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/utils.h

@@ -173,7 +173,7 @@ static inline void ast_slinear_saturated_add(short *input, short value)
 {
 	int res;
 
-	res = *input + value;
+	res = (int) *input + value;
 	if (res > 32767)
 		*input = 32767;
 	else if (res < -32767)
@@ -186,7 +186,7 @@ static inline void ast_slinear_saturated_multiply(short *input, short value)
 {
 	int res;
 
-	res = *input * value;
+	res = (int) *input * value;
 	if (res > 32767)
 		*input = 32767;
 	else if (res < -32767)