target/riscv-011: Fix memory leak in handle_halt_routine()

Tested with SiFive HiFive1 development board.

Change-Id: Ie0d9fa0899804d17ccdd84b03ba4028e97b632b8
Signed-off-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-on: http://openocd.zylin.com/4884
Tested-by: jenkins
Reviewed-by: Tim Newsome <tim@sifive.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/target/riscv/riscv-011.c

@@ -1806,6 +1806,8 @@ static riscv_error_t handle_halt_routine(struct target *target)
 		}
 	}
 
+	scans_delete(scans);
+
 	if (dbus_busy) {
 		increase_dbus_busy_delay(target);
 		return RE_AGAIN;
@@ -1819,8 +1821,6 @@ static riscv_error_t handle_halt_routine(struct target *target)
 	info->dpc = reg_cache_get(target, CSR_DPC);
 	info->dcsr = reg_cache_get(target, CSR_DCSR);
 
-	scans_delete(scans);
-
 	cache_invalidate(target);
 
 	return RE_OK;