[C++]: fix call to unavailable image on release to not reference erased iterator.
[C++]: fix call to unavailable image on release to not reference erased iterator.

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