libinitramfs/logging: Do not reassign stderr

Reassigning stdin, stdout,stderr is not a portable solution. The
standard streams can be made to refer to different files with help of
the library function freopen(3), specially introduced to make it
possible to reassign stdin, stdout, and stderr.

Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com>

Author: legionus

runtime/src/libinitramfs/logging.c

@@ -143,10 +143,6 @@ void rd_log_setup_stderr(const char *logfile)
 	if (rdlog && !strcasecmp(rdlog, "console"))
 		logfile = "/dev/console";
 
-	FILE *cons = fopen(logfile, "w+");
-	if (!cons)
-		rd_fatal("open(%s): %m", logfile);
-
-	fclose(stderr);
-	stderr = cons;
+	if (!freopen(logfile, "w+", stderr))
+		rd_fatal("freopen(%s): %m", logfile);
 }