client: Fix return value check for sb_received().

This bug can cause the client to segfault if it is fed invalid data.

diff --git a/client_common.c b/client_common.c
index f615bb7289bd1951057a20743a21045019109a18..b47364c9bd7b91c09d2e0c28fedc69efd3e5c6d0 100644 (file)
--- a/client_common.c
+++ b/client_common.c
@@ -159,7 +159,10 @@ again:
        }
        if (n == 0)
                return 0;
-       if (!sb_received(ct->sbc[0], n, result))
+       ret = sb_received(ct->sbc[0], n, result);
+       if (ret < 0)
+               return ret;
+       if (ret == 0)
                goto again;
        ct->sbc[0] = NULL;
        return 1;