Cipher#iv_len returns incorrect IV length for AES cipher in ECB mode

[revodoge]

Cipher#iv_len is not returning the proper value for an ECB mode AES cipher.

MRI:

2.5.1 :002 > OpenSSL::Cipher.new("AES-128-ECB").iv_len
 => 0

JRuby:

jruby-9.1.15.0 :002 > OpenSSL::Cipher.new("AES-128-ECB").iv_len
 => 16

Since ECB mode does not rely on an IV, else if ( "ECB".equals(mode) ) should be above if ( "AES".equals(base) ) here so it returns 0

https://github.com/jruby/jruby-openssl/blob/master/src/main/java/org/jruby/ext/openssl/Cipher.java#L630