staging: dgap: fix sparse warnings for the entire cm_t structure

This patch fixes sparse warnings for the entire cm_t structure
This entire structure defines a hardware segment
Signed-off-by: Mark Hounschell <markh@compro.net>
Tested-by: Mark Hounschell <markh@compro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgap/dgap.c

@@ -1304,7 +1304,7 @@ static int dgap_tty_init(struct board_t *brd)
 	u8 modem = 0;
 	struct channel_t *ch;
 	struct bs_t __iomem *bs;
-	struct cm_t *cm;
+	struct cm_t __iomem *cm;
 
 	if (!brd)
 		return -ENXIO;
@@ -4744,7 +4744,7 @@ static void dgap_cmdb(struct channel_t *ch, u8 cmd, u8 byte1,
 			u8 byte2, uint ncmds)
 {
 	char __iomem	*vaddr;
-	struct cm_t	*cm_addr = NULL;
+	struct __iomem cm_t *cm_addr;
 	uint		count;
 	uint		n;
 	u16		head;
@@ -4829,7 +4829,7 @@ static void dgap_cmdb(struct channel_t *ch, u8 cmd, u8 byte1,
 static void dgap_cmdw(struct channel_t *ch, u8 cmd, u16 word, uint ncmds)
 {
 	char __iomem	*vaddr;
-	struct cm_t	*cm_addr = NULL;
+	struct __iomem cm_t *cm_addr;
 	uint		count;
 	uint		n;
 	u16		head;
@@ -4912,7 +4912,7 @@ static void dgap_cmdw(struct channel_t *ch, u8 cmd, u16 word, uint ncmds)
 static void dgap_cmdw_ext(struct channel_t *ch, u16 cmd, u16 word, uint ncmds)
 {
 	char __iomem	*vaddr;
-	struct cm_t	*cm_addr = NULL;
+	struct __iomem cm_t *cm_addr;
 	uint		count;
 	uint		n;
 	u16		head;

drivers/staging/dgap/dgap.h

@@ -969,7 +969,7 @@ struct digi_cmd {
 struct channel_t {
 	int magic;			/* Channel Magic Number		*/
 	struct bs_t __iomem *ch_bs;	/* Base structure pointer       */
-	struct cm_t	*ch_cm;		/* Command queue pointer        */
+	struct cm_t __iomem *ch_cm;	/* Command queue pointer        */
 	struct board_t *ch_bd;		/* Board structure pointer      */
 	unsigned char *ch_vaddr;	/* FEP memory origin            */
 	unsigned char *ch_taddr;	/* Write buffer origin          */