staging/rdma/hfi1: Fix error in hfi1 driver build

hfi1 driver build fails with the following error:
In function ‘handle_receive_interrupt’:
error: implicit declaration of function ‘skip_rcv_packet’ [-Werror=implicit-function-declaration]
    last = skip_rcv_packet(&packet, thread);
    ^
This is due to the inclusion of the skip_rcv_packet() in the
CONFIG_PRESCAN_RXQ ifdef block. This function is independent of
CONFIG_PRESCAN_RXQ and should be outside this block.

Fixes: 82c2611d ("staging/rdma/hfi1: Handle packets with invalid RHF on context 0")
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/hfi1/driver.c

@@ -633,6 +633,7 @@ static void prescan_rxq(struct hfi1_packet *packet)
 		update_ps_mdata(&mdata, rcd);
 	}
 }
+#endif /* CONFIG_PRESCAN_RXQ */
 
 static inline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
 {
@@ -659,7 +660,6 @@ static inline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
 
 	return ret;
 }
-#endif /* CONFIG_PRESCAN_RXQ */
 
 static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
 {