fixed some compiler warnings

diff --git a/check/genex.cpp b/check/genex.cpp
index 940e6ec..8875ed6 100644 (file)
--- a/check/genex.cpp
+++ b/check/genex.cpp
@@ -151,4 +151,6 @@ sparse_tree(const symbol & x,
                        } else
                                return random_symbol(x,y,z,rational,complex);
        }
+
+       return 0;
 }