Fixing an issue with setIdentity calling the callback a second time in the case that the first request failed.
Fixing an issue with setIdentity calling the callback a second time in the case that the first request failed.

BranchMetrics/ios-branch-deep-linking,BranchMetrics/iOS-Deferred-Deep-Linking-SDK,BranchMetrics/iOS-Deferred-Deep-Linking-SDK,BranchMetrics/ios-branch-deep-linking,BranchMetrics/ios-branch-deep-linking,BranchMetrics/ios-branch-deep-linking