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diff -up hdparm-9.60/sysfs.c.bak hdparm-9.60/sysfs.c
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--- hdparm-9.60/sysfs.c.bak	2021-04-15 15:48:56.806354847 +0200
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+++ hdparm-9.60/sysfs.c	2021-04-16 14:44:42.520395436 +0200
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@@ -61,7 +61,8 @@ static int sysfs_write_attr (char *path,
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 		if (count < 0)
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 			err = errno;
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 	}
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-	fclose(fp);
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+	if (fp)
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+		fclose(fp);
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 	if (err && verbose) perror(path);
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 	*pathtail = '\0';
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 	return err;