powerpc/uaccess: Merge raw_copy_to_user_allowed() into raw_copy_to_user()

Since commit 17bc43367f ("powerpc/uaccess: Implement
unsafe_copy_to_user() as a simple loop"), raw_copy_to_user_allowed()
is only used by raw_copy_to_user().

Merge raw_copy_to_user_allowed() into raw_copy_to_user().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3ae114740317187e12edbd5ffa9157cb8c396dea.1612879284.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/uaccess.h

@@ -401,19 +401,13 @@ static inline unsigned long raw_copy_from_user(void *to,
 	return ret;
 }
 
-static inline unsigned long
-raw_copy_to_user_allowed(void __user *to, const void *from, unsigned long n)
-{
-	return __copy_tofrom_user(to, (__force const void __user *)from, n);
-}
-
 static inline unsigned long
 raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 {
 	unsigned long ret;
 
 	allow_write_to_user(to, n);
-	ret = raw_copy_to_user_allowed(to, from, n);
+	ret = __copy_tofrom_user(to, (__force const void __user *)from, n);
 	prevent_write_to_user(to, n);
 	return ret;
 }