Fix return type to be conformant with CTest. (#160)

Co-authored-by: Adam Osewski <aosewski@amd.com>

test/conv_util/conv_util.cpp

@@ -193,5 +193,5 @@ int main(void)
               << std::endl;
     res = TestGetHostTensorDescriptor();
     std::cout << "TestGetHostTensorDescriptor ..... " << (res ? "SUCCESS" : "FAILURE") << std::endl;
-    return 0;
+    return res ? 0 : 1;
 }

test/convnd_fwd/conv1d_fwd.cpp

@@ -146,4 +146,6 @@ int main()
     res = TestConv1DNWCInt8Instances();
     std::cout << "\nTestConv1DNWCInt8Instances ..... " << (res ? "SUCCESS" : "FAILURE")
               << std::endl;
+
+    return res ? 0 : 1;
 }

test/convnd_fwd/conv2d_fwd.cpp

@@ -143,5 +143,5 @@ int main()
     std::cout << "\nTestConv2DNHWCInt8Instances ..... " << (res ? "SUCCESS" : "FAILURE")
               << std::endl;
 
-    return 0;
+    return res ? 0 : 1;
 }

test/convnd_fwd/conv3d_fwd.cpp

@@ -290,5 +290,5 @@ int main()
     std::cout << "\nTestConv3DNDHWCInt8Instances ..... " << (res ? "SUCCESS" : "FAILURE")
               << std::endl;
 
-    return 0;
+    return res ? 0 : 1;
 }

test/reference_conv_fwd/reference_conv_fwd.cpp

@@ -422,5 +422,5 @@ int main(void)
     std::cout << "TestConv1DNHWC ..... " << (res ? "SUCCESS" : "FAILURE") << std::endl;
     res = TestConv3DNCDHW();
     std::cout << "TestConv3DNCDHW ..... " << (res ? "SUCCESS" : "FAILURE") << std::endl;
-    return 0;
+    return res ? 0 : 1;
 }