Minor code beautification in contrib/sslinfo.

Static-ify some functions that didn't need to be exported, and improve
a couple of comments.

Gurjeet Singh

contrib/sslinfo/sslinfo.c

@@ -31,9 +31,10 @@ Datum		ssl_client_dn_field(PG_FUNCTION_ARGS);
 Datum		ssl_issuer_field(PG_FUNCTION_ARGS);
 Datum		ssl_client_dn(PG_FUNCTION_ARGS);
 Datum		ssl_issuer_dn(PG_FUNCTION_ARGS);
-Datum		X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-Datum		X509_NAME_to_text(X509_NAME *name);
-Datum		ASN1_STRING_to_text(ASN1_STRING *str);
+
+static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
+static Datum X509_NAME_to_text(X509_NAME *name);
+static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 
 /*
@@ -51,7 +52,7 @@ ssl_is_used(PG_FUNCTION_ARGS)
 
 
 /*
- * Returns SSL cipher currently in use.
+ * Returns SSL version currently in use.
  */
 PG_FUNCTION_INFO_V1(ssl_version);
 Datum
@@ -77,7 +78,7 @@ ssl_cipher(PG_FUNCTION_ARGS)
 
 
 /*
- * Indicates whether current client have provided a certificate
+ * Indicates whether current client provided a certificate
  *
  * Function has no arguments.  Returns bool.  True if current session
  * is SSL session and client certificate is verified, otherwise false.
@@ -138,7 +139,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
  * Returns Datum, which can be directly returned from a C language SQL
  * function.
  */
-Datum
+static Datum
 ASN1_STRING_to_text(ASN1_STRING *str)
 {
 	BIO		   *membuf;
@@ -182,7 +183,7 @@ ASN1_STRING_to_text(ASN1_STRING *str)
  * Returns result of ASN1_STRING_to_text applied to appropriate
  * part of name
  */
-Datum
+static Datum
 X509_NAME_field_to_text(X509_NAME *name, text *fieldName)
 {
 	char	   *string_fieldname;
@@ -287,7 +288,7 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
  * Returns: text datum which contains string representation of
  * X509_NAME
  */
-Datum
+static Datum
 X509_NAME_to_text(X509_NAME *name)
 {
 	BIO		   *membuf = BIO_new(BIO_s_mem());