core: ltc: fix missing mutex unlock

Fixes a missing mutex unlock on an out of memory error in ltc_ecc_fp_save_state(). Signed-off-by: Ryan Cai <ycaibb@gmail.com> Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

Author: ycaibb

core/lib/libtomcrypt/src/math/fp/ltc_ecc_fp_mulmod.c

@@ -1436,8 +1436,10 @@ int ltc_ecc_fp_save_state(unsigned char **out, unsigned long *outlen)
  * and the mu INTEGER
  */
  cache_entry = XCALLOC(FP_ENTRIES*(2*(1U<<FP_LUT)+4)+3, sizeof(ltc_asn1_list));
- if (cache_entry == NULL)
- return CRYPT_MEM;
+ if (cache_entry == NULL) {
+ err = CRYPT_MEM;
+ goto save_err;
+ }
  j = 1; /* handle the zero'th element later */
 
  LTC_SET_ASN1(cache_entry, j++, LTC_ASN1_SHORT_INTEGER, &fp_entries, 1);