reactor: call callback if no need to set intr

When do spdk_reactor_set_interrupt_mode, if reactor
already runs in the specific mode, directly call
callback function before return 0;

Change-Id: I1fd8b753e9881755aa128aabe6d1e2749e58b39b
Signed-off-by: Liu Xiaodong <xiaodong.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7549
Community-CI: Mellanox Build Bot
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: <dongx.yi@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

lib/event/reactor.c

@@ -443,6 +443,7 @@ spdk_reactor_set_interrupt_mode(uint32_t lcore, bool new_in_interrupt,
 	}
 
 	if (target->in_interrupt == new_in_interrupt) {
+		cb_fn(cb_arg);
 		return 0;
 	}