staging: wlags49: don't use custom implementation of atoi()

Kernel has its own method called simple_strtoul() to do such things.

Here we are using simple_strtoul(value, NULL, 0) because in original function
the recognized base is 10 or 16 and input data is assumed to be unsigned.
Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/wlags49_h2/wl_main.c

@@ -3792,7 +3792,7 @@ static int write_int(struct file *file, const char *buffer, unsigned long count,
 	}
 	if  (count > 0 ) {
 		proc_number[count] = 0;
-		nr = wl_atoi( proc_number );
+		nr = simple_strtoul(proc_number , NULL, 0);
  		*(unsigned int *)data = nr;
 		if ( nr & 0x8000 ) {	//;?kludgy but it is unclear to me were else to place this
 #if DBG

drivers/staging/wlags49_h2/wl_util.c

@@ -1536,52 +1536,3 @@ int wl_get_tallies(struct wl_private *lp,
     return ret;
 }
 
-/*******************************************************************************
- *	wl_atoi()
- *******************************************************************************
- *
- *  DESCRIPTION:
- *
- *      Believe it or not, we need our own implementation of atoi in the kernel.
- *
- *  PARAMETERS:
- *
- *      string  - the ASCII string to convert to an integer
- *
- *  RETURNS:
- *
- *      unsigned integer
- *
- ******************************************************************************/
-unsigned int wl_atoi( char *string )
-{
-unsigned int base = 10;				//default to decimal
-unsigned int value = 0;
-unsigned int c;
-int i = strlen( string );
-
-	if ( i > 2 && string[0] == '0' && ( string[1] | ('X'^'x') ) == 'x' ) {
-		base = 16;
-		string +=2;
-	}
-	while ( ( c = *string++ ) != '\0' ) {
-		if ( value > UINT_MAX / base ) {	//test for overrun
-			DBG_FUNC( "wl_atoi" );	//don't overload the log file with good messages
-			DBG_ENTER( DbgInfo );
-			DBG_ERROR( DbgInfo, "string \"%s\", lenght exceeds expectations\n", string );
-			printk( "<1>string \"%s\", lenght exceeds expectations\n", string );
-			DBG_LEAVE( DbgInfo );
-			break;
-		}
-		c -= '0';
-		if ( 0 <= c && c <= 9 ) value = base * value + c;
-		else if ( base == 16 ) {
-			c += '0';
-			c |= 'A'^'a';
-			c = c - 'a'+ 10;
-			if ( 10 <= c && c <= 15 ) value = base * value + c;
-		}
-	}
-	return value;
-} // wl_atoi
-

drivers/staging/wlags49_h2/wl_util.h

@@ -100,6 +100,4 @@ void wl_process_updated_record( struct wl_private *lp );
 void wl_process_assoc_status( struct wl_private *lp );
 void wl_process_security_status( struct wl_private *lp );
 
-unsigned int wl_atoi( char *string );
-
 #endif  // __WL_UTIL_H__