[SWDEV-524528] Nullptr check correction for TestErrCntRead

Signed-off-by: Maisam Arif <Maisam.Arif@amd.com>
Change-Id: I1331a69544a6f5b7b61ea4655b635b42bbb56444

rocm_smi/src/rocm_smi.cc

@@ -643,8 +643,6 @@ rsmi_dev_ecc_count_get(uint32_t dv_ind, rsmi_gpu_block_t block,
   TRY
   ss << __PRETTY_FUNCTION__ << "| ======= start =======";
   LOG_TRACE(ss);
-  CHK_SUPPORT_VAR(ec, block)
-
 
   amd::smi::DevInfoTypes type;
   switch (block) {
@@ -704,6 +702,10 @@ rsmi_dev_ecc_count_get(uint32_t dv_ind, rsmi_gpu_block_t block,
     return ret;
   }
 
+  if (ec == nullptr) {
+    return RSMI_STATUS_INVALID_ARGS;
+  }
+
   std::string junk;
   std::istringstream fs1(val_vec[0]);