Fix compiler warnings (NFC)

Signed-off-by: Eric Kunze <eric.kunze@arm.com>
Change-Id: I8645382983c257e5102982d487283560088e2d2a
diff --git a/reference_model/src/ops/ewise_binary.cc b/reference_model/src/ops/ewise_binary.cc
index 3fa4194..be621cb 100644
--- a/reference_model/src/ops/ewise_binary.cc
+++ b/reference_model/src/ops/ewise_binary.cc
@@ -450,10 +450,10 @@
         case TOSA_REF_TYPE_FP16:
         case TOSA_REF_TYPE_BF16:
         case TOSA_REF_TYPE_FP32:
-            this->fcn = [shift](InEigenType a, InEigenType b) -> OutEigenType { return fpTrunc<OutDtype>(a * b); };
+            this->fcn = [](InEigenType a, InEigenType b) -> OutEigenType { return fpTrunc<OutDtype>(a * b); };
             break;
         case TOSA_REF_TYPE_FP64:
-            this->fcn = [shift](InEigenType a, InEigenType b) -> OutEigenType { return a * b; };
+            this->fcn = [](InEigenType a, InEigenType b) -> OutEigenType { return a * b; };
             break;
         case TOSA_REF_TYPE_INT32:
             this->fcn = [this, shift](InEigenType a, InEigenType b) -> OutEigenType {
@@ -481,7 +481,7 @@
             break;
         case TOSA_REF_TYPE_INT8:
         case TOSA_REF_TYPE_INT16:
-            this->fcn = [this](InEigenType lhs, InEigenType rhs) -> OutEigenType {
+            this->fcn = [](InEigenType lhs, InEigenType rhs) -> OutEigenType {
                 OutEigenType raw_output = (OutEigenType)lhs * (OutEigenType)rhs;
 
                 OutEigenType clamped_output = std::min<OutEigenType>(QMax, std::max<OutEigenType>(raw_output, QMin));
diff --git a/reference_model/src/verify.cc b/reference_model/src/verify.cc
index 89d1b67..18abf0b 100644
--- a/reference_model/src/verify.cc
+++ b/reference_model/src/verify.cc
@@ -114,7 +114,7 @@
         if (S != 1 && S != 2)
         {
             // Check error bias magnitude for data sets S which are not positive biased
-            REQUIRE(abs(err_sum) <= 2 * sqrt(KS * T));
+            REQUIRE(std::abs(err_sum) <= 2 * sqrt(KS * T));
         }
         // Check error variance magnitude
         REQUIRE(err_sum_sq <= 0.4 * KS * T);