message: Fix AliDataFile
  add parentheses for assignment
diff: @@ -17,7 +17,7 @@ std::string AliDataFile::GetFileName(const std::string &url) {
  std::string buf, ver, year;
  const char *env;
  - if (env = gSystem->Getenv("ALIPHYSICS_VERSION")) {
  + if ((env = gSystem->Getenv("ALIPHYSICS_VERSION"))) {
  buf = env;
  if (buf.length() >= 12) {
  ver = buf.substr(0, 12);
  @@ -25,7 +25,7 @@ std::string AliDataFile::GetFileName(const std::string &url) {
  }
  }
  - if (env = gSystem->Getenv("ALICE_DATA")) {
  + if ((env = gSystem->Getenv("ALICE_DATA"))) {
  buf = std::string(env) + "/" + url;
  if (!gSystem->AccessPathName(buf.c_str())) {
  AliDebugClass(2, TString::Format("Using data file \"%s\" from \"%s\"", url.c_str(), buf.c_str()));
  @@ -33,7 +33,7 @@ std::string AliDataFile::GetFileName(const std::string &url) {
  }
  }
  - if (env = gSystem->Getenv("ALICE_PHYSICS")) {
  + if ((env = gSystem->Getenv("ALICE_PHYSICS"))) {
  buf = std::string(env) + "/" + url;
  if (!gSystem->AccessPathName(buf.c_str())) {
  AliDebugClass(2, TString::Format("Using data file \"%s\" from \"%s\"", url.c_str(), buf.c_str()));
  @@ -41,7 +41,7 @@ std::string AliDataFile::GetFileName(const std::string &url) {
  }
  }
  - if (env = gSystem->Getenv("ALICE_ROOT")) {
  + if ((env = gSystem->Getenv("ALICE_ROOT"))) {
  buf = std::string(env) + "/" + url;
  if (!gSystem->AccessPathName(buf.c_str())) {
  AliDebugClass(2, TString::Format("Using data file \"%s\" from \"%s\"", url.c_str(), buf.c_str()));
  @@ -50,7 +50,7 @@ std::string AliDataFile::GetFileName(const std::string &url) {
  }
  if (!ver.empty() && !year.empty()) {
  - if (env = gSystem->Getenv("ALICE_ROOT")) {
  + if ((env = gSystem->Getenv("ALICE_ROOT"))) {
  buf = std::string(env) + "/../../../../data/analysis/" + year + "/" + ver + "/" + url;
  if (!gSystem->AccessPathName(buf.c_str())) {
  AliDebugClass(2, TString::Format("Using data file \"%s\" from \"%s\"", url.c_str(), buf.c_str()));
  @@ -73,7 +73,7 @@ std::string AliDataFile::GetFileNameOADB(const std::string &url) {
  std::string buf;
  const char *env;
  - if (env = gSystem->Getenv("OADB_PATH")) {
  + if ((env = gSystem->Getenv("OADB_PATH"))) {
  buf = std::string(env) + "/" + url;
  if (!gSystem->AccessPathName(buf.c_str())) {
  AliDebugClass(2, TString::Format("Using data file \"%s\" from \"%s\"", url.c_str(), buf.c_str()));
  