Fix odd bitlength RSA key generation

Fix issue that caused a hang up when generating RSA keys of odd
bitlength.
diff --git a/ChangeLog b/ChangeLog
index f3e6d1d..1581a3a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -7,6 +7,7 @@
      arguments where the same (in-place doubling). Found and fixed by Janos
      Follath. #309
    * Fix issue in Makefile that prevented building using armar. #386
+   * Fix issue that caused a hang up when generating RSA keys of odd bitlength
 
 Changes
    * On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5,