cleanup cpplint warnings

Suggested by James Zern to clear out cpplint warnings for all unit
test code.

Change-Id: I731a3fa4d2a257eb9ef733426ba84286fbd7ea34

test/idct_test.cc

diff --git a/test/idct_test.cc b/test/idct_test.cc
index aa786cb..ea61e0b 100644
--- a/test/idct_test.cc
+++ b/test/idct_test.cc
@@ -16,7 +16,7 @@
 #include "test/register_state_check.h"
 #include "third_party/googletest/src/include/gtest/gtest.h"
 
-typedef void (*idct_fn_t)(short *input, unsigned char *pred_ptr,
+typedef void (*idct_fn_t)(int16_t *input, unsigned char *pred_ptr,
                           int pred_stride, unsigned char *dst_ptr,
                           int dst_stride);
 namespace {
@@ -34,7 +34,7 @@
   virtual void TearDown() { libvpx_test::ClearSystemState(); }
 
   idct_fn_t UUT;
-  short input[16];
+  int16_t input[16];
   unsigned char output[256];
   unsigned char predict[256];
 };