macos: fix leak in proc_self_dirname()

diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index efc429529158833292ab47f4eea0ad3aa47f2631..cb6fdc2f49dbc2d18fefa3a41c90422f0afd30d3 100644 (file)
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -797,7 +797,9 @@ std::string proc_self_dirname()
                path = (char *) realloc((void *) path, buflen);
        while (buflen > 0 && path[buflen-1] != '/')
                buflen--;
-       return std::string(path, buflen);
+       std::string str(path, buflen);
+       free(path);
+       return str;
 }
 #elif defined(_WIN32)
 std::string proc_self_dirname()