mshow: list, reply: skip leading spaces for file names

mshow.c

@@ -386,6 +386,8 @@ list_mime(int depth, struct message *msg, char *body, size_t bodylen)
 void
 list(char *file)
 {
+	while (*file == ' ' || *file == '\t')
+		file++;
 	struct message *msg = blaze822_file(file);
 	if (!msg)
 		return;
@@ -397,6 +399,8 @@ list(char *file)
 void
 reply(char *file)
 {
+	while (*file == ' ' || *file == '\t')
+		file++;
 	struct message *msg = blaze822_file(file);
 	if (!msg)
 		return;