Added return error code hipErrorInvalidValue in hipMemGetInfo

Change-Id: If01b012136b655ff8eb4878eb703dfe3e6a36530

src/hip_memory.cpp

@@ -864,6 +864,9 @@ hipError_t hipMemGetInfo  (size_t *free, size_t *total)
         if (total) {
             *total = device->_props.totalGlobalMem;
         }
+        else {
+             e = hipErrorInvalidValue;
+        }
 
         if (free) {
             // TODO - replace with kernel-level for reporting free memory:
@@ -872,6 +875,9 @@ hipError_t hipMemGetInfo  (size_t *free, size_t *total)
 
             *free =  device->_props.totalGlobalMem - deviceMemSize;
         }
+        else {
+             e = hipErrorInvalidValue;
+        }
 
     } else {
         e = hipErrorInvalidDevice;