crypto: sig - Remove some unused functions

These functions are defined in the sig.c file, but not called elsewhere,
so delete these unused functions.

crypto/sig.c:24:34: warning: unused function '__crypto_sig_tfm'.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5701
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/sig.c

@@ -21,11 +21,6 @@
 
 static const struct crypto_type crypto_sig_type;
 
-static inline struct crypto_sig *__crypto_sig_tfm(struct crypto_tfm *tfm)
-{
-	return container_of(tfm, struct crypto_sig, base);
-}
-
 static int crypto_sig_init_tfm(struct crypto_tfm *tfm)
 {
 	if (tfm->__crt_alg->cra_type != &crypto_sig_type)