Fix compilation warnings in cryptohash_openssl.c

These showed up with -O2.  Oversight in 87ae9691.

Author: Fujii Masao
Discussion: https://postgr.es/m/cee3df00-566a-400c-1252-67c3701f918a@oss.nttdata.com

src/common/cryptohash_openssl.c

@@ -119,7 +119,7 @@ pg_cryptohash_init(pg_cryptohash_ctx *ctx)
 int
 pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
 {
-	int			status;
+	int			status = 0;
 
 	if (ctx == NULL)
 		return 0;
@@ -154,7 +154,7 @@ pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
 int
 pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest)
 {
-	int			status;
+	int			status = 0;
 
 	if (ctx == NULL)
 		return 0;