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acm_random,Rand9Signed: correct cast

convert the random value to int16 before subtracting 256 from it; quiets
a ubsan (sanitize=integer) warning

BUG=webm:1225

Change-Id: Ibc2c5a21f30e112bd6c180f7d6a033327c38d0df

--- a/test/acm_random.h

+++ b/test/acm_random.h

@@ -35,7 +35,7 @@

   int16_t Rand9Signed(void) {

     // Use 9 bits: values between 255 (0x0FF) and -256 (0x100).

     const uint32_t value = random_.Generate(512);

-    return static_cast<int16_t>(value - 256);

+    return static_cast<int16_t>(value) - 256;

   }

   uint8_t Rand8(void) {