Revert "Remove Wextra warnings from vp9_sad.c"

This reverts commit 7ab9a9587b96db4edce6be916c1f02297a9555ff

Nightly test http://build.webmproject.org/jenkins/view/libvpx-nightly-tests/job/libvpx%20unit%20tests%20(valgrind-2)/arch=x86_64-linux-gcc,filter=-*VP8*:*Large.*/276/console

Failed 

This patch did not address all the assembly issues 
some of the vp8 assembly counts on 5 arguments being passed in to this function:   

one example : vp8_sad8x16_wmt

Please address or split this into vp9 and vp8 patches.

Change-Id: I78afcc171649894f887bb8ee3c66de24aaddc7ca

test/sad_test.cc

diff --git a/test/sad_test.cc b/test/sad_test.cc
index 23adbda..a692891 100644
--- a/test/sad_test.cc
+++ b/test/sad_test.cc
@@ -32,7 +32,8 @@
 typedef unsigned int (*sad_m_by_n_fn_t)(const unsigned char *source_ptr,
                                         int source_stride,
                                         const unsigned char *reference_ptr,
-                                        int reference_stride);
+                                        int reference_stride,
+                                        unsigned int max_sad);
 typedef std::tr1::tuple<int, int, sad_m_by_n_fn_t> sad_m_by_n_test_param_t;
 
 typedef void (*sad_n_by_n_by_4_fn_t)(const uint8_t *src_ptr,
@@ -86,7 +87,7 @@
 
   // Sum of Absolute Differences. Given two blocks, calculate the absolute
   // difference between two pixels in the same relative location; accumulate.
-  unsigned int ReferenceSAD(int block_idx = 0) {
+  unsigned int ReferenceSAD(unsigned int max_sad, int block_idx = 0) {
     unsigned int sad = 0;
     const uint8_t* const reference = GetReference(block_idx);
 
@@ -95,6 +96,9 @@
         sad += abs(source_data_[h * source_stride_ + w]
                - reference[h * reference_stride_ + w]);
       }
+      if (sad > max_sad) {
+        break;
+      }
     }
     return sad;
   }
@@ -130,20 +134,21 @@
   SADTest() : SADTestBase(GET_PARAM(0), GET_PARAM(1)) {}
 
  protected:
-  unsigned int SAD(int block_idx = 0) {
+  unsigned int SAD(unsigned int max_sad, int block_idx = 0) {
     unsigned int ret;
     const uint8_t* const reference = GetReference(block_idx);
 
     REGISTER_STATE_CHECK(ret = GET_PARAM(2)(source_data_, source_stride_,
-                                            reference, reference_stride_));
+                                            reference, reference_stride_,
+                                            max_sad));
     return ret;
   }
 
   void CheckSad(unsigned int max_sad) {
     unsigned int reference_sad, exp_sad;
 
-    reference_sad = ReferenceSAD();
-    exp_sad = SAD();
+    reference_sad = ReferenceSAD(max_sad);
+    exp_sad = SAD(max_sad);
 
     if (reference_sad <= max_sad) {
       ASSERT_EQ(exp_sad, reference_sad);
@@ -174,7 +179,7 @@
 
     SADs(exp_sad);
     for (int block = 0; block < 4; block++) {
-      reference_sad = ReferenceSAD(block);
+      reference_sad = ReferenceSAD(UINT_MAX, block);
 
       EXPECT_EQ(exp_sad[block], reference_sad) << "block " << block;
     }