Avoid unnecessary copying of a string in pg_restore.c

Coverity complained about a possible overrun in the copy, but there is
no actual need to copy the string at all.

src/bin/pg_dump/pg_restore.c

@@ -1052,14 +1052,14 @@ get_dbname_oid_list_from_mfile(const char *dumpdirpath, SimpleOidStringList *dbn
 	{
 		Oid			db_oid = InvalidOid;
 		char		db_oid_str[MAXPGPATH + 1] = "";
-		char		dbname[MAXPGPATH + 1] = "";
+		char	   *dbname;
 
 		/* Extract dboid. */
 		sscanf(line, "%u", &db_oid);
 		sscanf(line, "%20s", db_oid_str);
 
-		/* Now copy dbname. */
-		strcpy(dbname, line + strlen(db_oid_str) + 1);
+		/* dbname is the rest of the line */
+		dbname = line + strlen(db_oid_str) + 1;
 
 		/* Remove \n from dbname. */
 		dbname[strlen(dbname) - 1] = '\0';