Fix ROOT error code interpretation

km3buu/output.py

@@ -33,7 +33,7 @@ try:
     libpath = environ.get("KM3NET_LIB")
     if libpath is None:
         libpath = Config().km3net_lib_path
-    if ROOT.gSystem.Load(join(libpath, "libKM3NeTROOT.so")) != 0:
+    if ROOT.gSystem.Load(join(libpath, "libKM3NeTROOT.so")) < 0:
         raise ModuleNotFoundError("KM3NeT dataformat library not found!")
 except ModuleNotFoundError:
     import warnings

km3buu/tests/test_output.py

@@ -31,7 +31,7 @@ try:
     if libpath is None:
         libpath = Config().km3net_lib_path
     KM3NET_LIB_AVAILABLE = (ROOT.gSystem.Load(join(libpath,
-                                                   "libKM3NeTROOT.so")) == 0)
+                                                   "libKM3NeTROOT.so")) >= 0)
 except ModuleNotFoundError:
     KM3NET_LIB_AVAILABLE = False