SWDEV-353807 - Fixes multiple catch issues (#2912)

- enforcing c++17 for all tests
- Warning as error: ignoring return value

Change-Id: I3d171540403f74222e631d1a8e393386461c9729

catch/multiproc/deviceAllocationMproc.cc

@@ -246,7 +246,7 @@ static bool testDeviceMemMulProc(bool testmalloc) {
     }
     // close the read-descriptor
     close(fd[0]);
-    hipFree(result_d);
+    HIP_CHECK(hipFree(result_d));
     free(result_h);
     // wait for child exit
     wait(NULL);
@@ -279,7 +279,7 @@ static bool testDeviceMemMulProc(bool testmalloc) {
     write(fd[1], result_h, sizeof(int));
     // close the write descriptor:
     close(fd[1]);
-    hipFree(result_d);
+    HIP_CHECK(hipFree(result_d));
     free(result_h);
     exit(0);
   }

catch/multiproc/hipHostMallocTestsMproc.cc

@@ -190,7 +190,7 @@ static bool validatePageTableAllocations(const char *devList, int visDevCnt) {
     setenv("HIP_VISIBLE_DEVICES", devList, 1);
 
     // First Call to initialize hip api
-    hipGetDeviceCount(&tmpdev);
+    HIP_CHECK(hipGetDeviceCount(&tmpdev));
 
 
     // Get memory snapshot before hostmalloc
@@ -214,7 +214,7 @@ static bool validatePageTableAllocations(const char *devList, int visDevCnt) {
         printf("Error while running rsmi_dev_memory_usage_get func\n");
         dlclose(rocm_smi_h);
         rsmi_shut_down_fp();
-        hipHostFree(ptr);
+        HIP_CHECK(hipHostFree(ptr));
         return false;
       }
       current.push_back(used);
@@ -236,7 +236,7 @@ static bool validatePageTableAllocations(const char *devList, int visDevCnt) {
       testPassed = false;
     }
 
-    hipHostFree(ptr);
+    HIP_CHECK(hipHostFree(ptr));
 
     // writing only, no need for read-descriptor
     close(fd[0]);