[SYCL] Check HostPtr is not null in SYCLMemObjT (#10426)

Signed-off-by: Michael Aziz <[email protected]>

Author: 0x12CC

sycl/source/detail/sycl_mem_obj_t.hpp

@@ -186,13 +186,15 @@ class __SYCL_EXPORT SYCLMemObjT : public SYCLMemObjI {
       });
     }
 
-    if (canReuseHostPtr(HostPtr, RequiredAlign)) {
-      MUserPtr = HostPtr;
-    } else {
-      setAlign(RequiredAlign);
-      MShadowCopy = allocateHostMem();
-      MUserPtr = MShadowCopy;
-      std::memcpy(MUserPtr, HostPtr, MSizeInBytes);
+    if (HostPtr) {
+      if (canReuseHostPtr(HostPtr, RequiredAlign)) {
+        MUserPtr = HostPtr;
+      } else {
+        setAlign(RequiredAlign);
+        MShadowCopy = allocateHostMem();
+        MUserPtr = MShadowCopy;
+        std::memcpy(MUserPtr, HostPtr, MSizeInBytes);
+      }
     }
   }