Fix get_last_error/1

Make sure to use the correct `get/1` function.
diff --git a/src/erlfdb.erl b/src/erlfdb.erl
index 03e3d08..cca497a 100644
--- a/src/erlfdb.erl
+++ b/src/erlfdb.erl
@@ -569,7 +569,7 @@
 
 
 get_last_error() ->
-    get(?ERLFDB_ERROR).
+    erlang:get(?ERLFDB_ERROR).
 
 
 clear_erlfdb_error() ->