drivers/net/skfp/ess.c: fix compile warnings

CC [M] drivers/net/skfp/ess.o
drivers/net/skfp/ess.c: In function 'ess_send_response':
drivers/net/skfp/ess.c:513: warning: cast from pointer to integer of different size
drivers/net/skfp/ess.c: In function 'ess_send_alc_req':
drivers/net/skfp/ess.c:609: warning: cast from pointer to integer of different size
drivers/net/skfp/ess.c:639: warning: cast from pointer to integer of different size

Signed-off-by: Takashi Iwai <[e-mail]>
Cc: Jeff Garzik <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/net/skfp/ess.c

···
 	chg->path.para.p_type = SMT_P320B ;
 	chg->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
 	chg->path.mib_index = SBAPATHINDEX ;
-	chg->path.path_pad = (u_short)NULL ;
+	chg->path.path_pad = 0;
 	chg->path.path_index = PRIMARY_RING ;
 
 	/* set P320F */
···
 	req->path.para.p_type = SMT_P320B ;
 	req->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
 	req->path.mib_index = SBAPATHINDEX ;
-	req->path.path_pad = (u_short)NULL ;
+	req->path.path_pad = 0;
 	req->path.path_index = PRIMARY_RING ;
 
 	/* set P0017 */
···
 	/* set P19 */
 	req->a_addr.para.p_type = SMT_P0019 ;
 	req->a_addr.para.p_len = sizeof(struct smt_p_0019) - PARA_LEN ;
-	req->a_addr.sba_pad = (u_short)NULL ;
+	req->a_addr.sba_pad = 0;
 	req->a_addr.alloc_addr = null_addr ;
 
 	/* set P1A */