vsprintf:fix: Change type returned by ustrtoul

The ustrtoul shall convert string defined size (e.g. 1GiB) to unsigned
long type (as its name implies).

Up till now it had returned int, which might cause problems with large
numbers (GiB range), when interpreted as U2 signed numbers.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

include/exports.h

@@ -23,7 +23,7 @@ char *getenv (const char *name);
 int setenv (const char *varname, const char *varvalue);
 long simple_strtol(const char *cp,char **endp,unsigned int base);
 int strcmp(const char * cs,const char * ct);
-int ustrtoul(const char *cp, char **endp, unsigned int base);
+unsigned long ustrtoul(const char *cp, char **endp, unsigned int base);
 #if defined(CONFIG_CMD_I2C)
 int i2c_write (uchar, uint, int , uchar* , int);
 int i2c_read (uchar, uint, int , uchar* , int);

lib/vsprintf.c

@@ -103,7 +103,7 @@ long simple_strtol(const char *cp, char **endp, unsigned int base)
 	return simple_strtoul(cp, endp, base);
 }
 
-int ustrtoul(const char *cp, char **endp, unsigned int base)
+unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
 {
 	unsigned long result = simple_strtoul(cp, endp, base);
 	switch (**endp) {