Merge pull request #186 from vlad-perevezentsev/fix_warnings

Fix problems in dpctl identified with Klockwork static code analysis

Author: PokhodenkoSA

backends/source/dppl_sycl_context_interface.cpp

@@ -47,7 +47,11 @@ bool DPPLContext_AreEq (__dppl_keep const DPPLSyclContextRef CtxRef1,
 
 bool DPPLContext_IsHost (__dppl_keep const DPPLSyclContextRef CtxRef)
 {
-    return unwrap(CtxRef)->is_host();
+    auto Ctx = unwrap(CtxRef);
+    if (Ctx) {
+        return Ctx->is_host();
+    }
+    return false;
 }
 
 void DPPLContext_Delete (__dppl_take DPPLSyclContextRef CtxRef)

backends/source/dppl_sycl_platform_interface.cpp

@@ -148,7 +148,12 @@ size_t DPPLPlatform_GetNumNonHostPlatforms ()
 
 size_t DPPLPlatform_GetNumNonHostBackends ()
 {
-    return get_set_of_non_hostbackends().size();
+    auto be_set = get_set_of_non_hostbackends();
+
+    if (be_set.empty())
+        return 0;
+
+    return be_set.size();
 }
 
 __dppl_give DPPLSyclBackendType *DPPLPlatform_GetListOfNonHostBackends ()