[PATCH RESEND] parameter: fix build warning when !CONFIG_PARAMETER

[Josh Cartwright]

Commit 51f2ded17c35c146488f6f3b697764bb2953a156 ("param: make return
value of param getter function const") made the parameter getter const,
but neglected to change the dev_add_param() function prototype in the
!CONFIG_PARAMETER case.

Fixes the following warning with CONFIG_NAND and !CONFIG_PARAMETER:

drivers/mtd/nand/nand_base.c: In function 'add_mtd_nand_device':
drivers/mtd/nand/nand_base.c:1720:2: warning: passing argument 4 of 'dev_add_param' from incompatible pointer type [enabled by default]
include/param.h:59:19: note: expected 'char * (*)(struct device_d *, struct param_d *)' but argument is of type 'const char * (*)(struct device_d *, struct param_d *)'

Signed-off-by: Josh Cartwright <joshc at eso.teric.us>
---
Sorry again for then noise!

 include/param.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/param.h b/include/param.h
index 21f4f7d..3a585cd 100644
--- a/include/param.h
+++ b/include/param.h
@@ -58,7 +58,7 @@ static inline struct param_d *get_param_by_name(struct device_d *dev,
 
 static inline int dev_add_param(struct device_d *dev, char *name,
 		int (*set)(struct device_d *dev, struct param_d *p, const char *val),
-		char *(*get)(struct device_d *, struct param_d *p),
+		const char *(*get)(struct device_d *, struct param_d *p),
 		unsigned long flags)
 {
 	return 0;
-- 
1.8.1.5