[PATCH] final csum_and_copy_from_user gcc4 warning fixes

The build is clean now.

include/asm-i386/checksum.h

@@ -47,7 +47,7 @@ unsigned int csum_partial_copy_from_user(const unsigned char __user *src, unsign
 						int len, int sum, int *err_ptr)
 {
 	might_sleep();
-	return csum_partial_copy_generic((__force char *)src, dst,
+	return csum_partial_copy_generic((__force unsigned char *)src, dst,
 					len, sum, err_ptr, NULL);
 }
 
@@ -181,7 +181,7 @@ static __inline__ unsigned int csum_and_copy_to_user(const unsigned char *src,
 {
 	might_sleep();
 	if (access_ok(VERIFY_WRITE, dst, len))
-		return csum_partial_copy_generic(src, (__force char *)dst, len, sum, NULL, err_ptr);
+		return csum_partial_copy_generic(src, (__force unsigned char *)dst, len, sum, NULL, err_ptr);
 
 	if (len)
 		*err_ptr = -EFAULT;