[C] Fix error check with parsing uri params for initial position.
[C] Fix error check with parsing uri params for initial position.

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