Fixed sizeof(err_val) to return the number of characters in the array

Change-Id: I7e4f04d10b2f9cc9dbed2431e53b5ebc540acf56

rocminfo.cc

@@ -72,7 +72,7 @@
     char* err_str = NULL;                                                     \
     if (hsa_status_string(err,                                                \
             (const char**)&err_str) != HSA_STATUS_SUCCESS) {                  \
-      snprintf(&(err_val[0]), sizeof(err_val[12]), "%#x", (uint32_t)err);     \
+      snprintf(&(err_val[0]), sizeof(err_val), "%#x", (uint32_t)err);         \
       err_str = &(err_val[0]);                                                \
     }                                                                         \
     printf("%shsa api call failure at: %s:%d\n",                              \