[glib] gvariant: Fix minor memory leak on error handling path

[Philip Withnall <pwithnall src gnome org>]

commit cd0bbbf1ef3d8ff273dee80c1039157c1474715d
Author: Sanjeev <sanjeev1 k samsung com>
Date:   Wed Nov 8 12:36:26 2017 +0000

    gvariant: Fix minor memory leak on error handling path
    
    (Commit message by Philip Withnall.)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=760022

 glib/gvariant-parser.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/glib/gvariant-parser.c b/glib/gvariant-parser.c
index e4ba192..3261bc1 100644
--- a/glib/gvariant-parser.c
+++ b/glib/gvariant-parser.c
@@ -1724,6 +1724,7 @@ bytestring_parse (TokenStream  *stream,
         parser_set_error (error, &ref, NULL,
                           G_VARIANT_PARSE_ERROR_UNTERMINATED_STRING_CONSTANT,
                           "unterminated string constant");
+        g_free (str);
         g_free (token);
         return NULL;
 
@@ -1734,6 +1735,7 @@ bytestring_parse (TokenStream  *stream,
             parser_set_error (error, &ref, NULL,
                               G_VARIANT_PARSE_ERROR_UNTERMINATED_STRING_CONSTANT,
                               "unterminated string constant");
+            g_free (str);
             g_free (token);
             return NULL;