[PATCH] fs: use kernel's hex_to_bin() method

[Andy Shevchenko <andy.shevchenko@gmail.com>]

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
---
 fs/binfmt_misc.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 9e60fd2..6c3855e 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -28,6 +28,7 @@
 #include <linux/mount.h>
 #include <linux/syscalls.h>
 #include <linux/fs.h>
+#include <linux/kernel.h>
 
 #include <asm/uaccess.h>
 
@@ -244,10 +245,8 @@ static int unquote(char *from)
 	while ((c = *s++) != '\0') {
 		if (c == '\\' && *s == 'x') {
 			s++;
-			c = toupper(*s++);
-			*p = (c - (isdigit(c) ? '0' : 'A' - 10)) << 4;
-			c = toupper(*s++);
-			*p++ |= c - (isdigit(c) ? '0' : 'A' - 10);
+			*p = hex_to_bin(*s++) << 4;
+			*p++ |= hex_to_bin(*s++);
 			continue;
 		}
 		*p++ = c;
-- 
1.7.1.1