[Java] Remove unneeded temporary variable in Image.
[Java] Remove unneeded temporary variable in Image.

EvilMcJerkface/Aeron,mikeb01/Aeron,EvilMcJerkface/Aeron,mikeb01/Aeron,mikeb01/Aeron,real-logic/Aeron,mikeb01/Aeron,real-logic/Aeron,real-logic/Aeron,EvilMcJerkface/Aeron,real-logic/Aeron,EvilMcJerkface/Aeron