pretty: remove reencode_commit_message()

This function has only two callsites, and is a thin wrapper whose
usefulness is dubious.  When the caller needs to learn the log
output encoding, it should be able to do so by directly calling
get_log_output_encoding() and calling the underlying
logmsg_reencode() with it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/blame.c

@@ -1425,7 +1425,7 @@ static void get_commit_info(struct commit *commit,
 			    int detailed)
 {
 	int len;
-	const char *subject;
+	const char *subject, *encoding;
 	char *reencoded, *message;
 	static char author_name[1024];
 	static char author_mail[1024];
@@ -1446,7 +1446,8 @@ static void get_commit_info(struct commit *commit,
 			die("Cannot read commit %s",
 			    sha1_to_hex(commit->object.sha1));
 	}
-	reencoded = reencode_commit_message(commit, NULL);
+	encoding = get_log_output_encoding();
+	reencoded = logmsg_reencode(commit, encoding);
 	message   = reencoded ? reencoded : commit->buffer;
 	ret->author = author_name;
 	ret->author_mail = author_mail;

commit.h

@@ -99,8 +99,6 @@ extern int has_non_ascii(const char *text);
 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 extern char *logmsg_reencode(const struct commit *commit,
 			     const char *output_encoding);
-extern char *reencode_commit_message(const struct commit *commit,
-				     const char **encoding_p);
 extern void get_commit_format(const char *arg, struct rev_info *);
 extern const char *format_subject(struct strbuf *sb, const char *msg,
 				  const char *line_separator);

pretty.c

@@ -1341,16 +1341,6 @@ void pp_remainder(const struct pretty_print_context *pp,
 	}
 }
 
-char *reencode_commit_message(const struct commit *commit, const char **encoding_p)
-{
-	const char *encoding;
-
-	encoding = get_log_output_encoding();
-	if (encoding_p)
-		*encoding_p = encoding;
-	return logmsg_reencode(commit, encoding);
-}
-
 void pretty_print_commit(const struct pretty_print_context *pp,
 			 const struct commit *commit,
 			 struct strbuf *sb)
@@ -1367,7 +1357,8 @@ void pretty_print_commit(const struct pretty_print_context *pp,
 		return;
 	}
 
-	reencoded = reencode_commit_message(commit, &encoding);
+	encoding = get_log_output_encoding();
+	reencoded = logmsg_reencode(commit, encoding);
 	if (reencoded) {
 		msg = reencoded;
 	}