YARN-5736 Addendum. Fixes segfault due to unterminated string. (Contributed by Miklos Szegedi via Daniel Templeton)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/configuration.c

@@ -156,6 +156,7 @@ char* trim(char* input)
     }
 
     strncpy(ret, val_begin, val_end - val_begin);
+    ret[val_end - val_begin] = '\0';
     return ret;
 }