[ReuseFutureTest] Do not reset the future on the last iteration

Resetting the Future on the last iteration may cause the assert that
the Future was never awaited to trigger (which is in the Future's destructor).

tests/ReuseFutureTest.cpp

@@ -38,9 +38,11 @@ void emperTest() {
 						DIE_MSG_ERRNO("read failed");
 					}
 
+					if (i != ITERATIONS - 1) {
 						// reset the BPS used to signal the completion of this future
 						read_future.reset();
 					}
+				}
 			},
 			cps);
 
@@ -53,9 +55,11 @@ void emperTest() {
 						DIE_MSG_ERRNO("write failed");
 					}
 
+					if (i != ITERATIONS - 1) {
 						// reset the BPS used to signal the completion of this future
 						write_future.reset();
 					}
+				}
 			},
 			cps);