Fix typo in variable name in qpol_policy_get_genfscon_by_name

This bug was found with "gcc -Wunused-but-set-variable" because error
variable was never used in qpol_policy_get_genfscon_by_name

libqpol/genfscon_query.c

@@ -76,7 +76,7 @@ int qpol_policy_get_genfscon_by_name(const qpol_policy_t * policy, const char *n
 		if (!(*genfscon)) {
 			error = errno;
 			ERR(policy, "%s", strerror(ENOMEM));
-			errno = errno;
+			errno = error;
 			return STATUS_ERR;
 		}
 		/* shallow copy only the struct pointer (genfscon) should be free()'ed */