Change fjfs command line parameters places.

Before calling convention was "fjfs filelist.txt mount-point" now
it is "fjfs mount-point filelist.txt".

This is done in preparation for using files listed on the command
line instead of reading filelist.txt.

README

            echo /etc/issue >> filelist.txt
            echo /etc/passwd >> filelist.txt
 
-     3. Create an empty file over which the files in the list will be joined
-           touch joined.txt
+     3. Mount fjfs
+           ./fjfs joined.txt filelist.txt
 
-     4. Mount fjfs
-           ./fjfs filelist.txt joined.txt
-
-     5. Check the result with
+     4. Check the result with
            cat joined.txt
 
         You will see the contents of all the files listed in filelist.txt
 
-     6. Unmount the fs
-           fusermount -u joined.txt
+     5. Unmount the fs
+           fusermount -u joined.txt && rm joined.txt

fjfs.c

 	struct stat sb;
 
 	if (argc < 3) {
-		fprintf(stderr, "Usage: %s filelist.txt mount-point-file\n", argv[0]);
+		fprintf(stderr, "Usage: %s mount-point-file filelist.txt\n", argv[0]);
 		exit(EXIT_FAILURE);
 	}
 
-	filenames  = argv[1];
-	mountpoint = argv[2];
+	mountpoint = argv[1];
+	filenames  = argv[2];
 
 	if (stat(mountpoint, &sb) == -1) {
 		FILE *f = fopen(mountpoint, "wb");

test/mount.sh

 #!/bin/sh
 
-set -e
-
-ulimit -c unlimited
-touch testmnt.txt
-../fjfs test.txt testmnt.txt
+../fjfs testmnt.txt test.txt
 

test/umount.sh

 #!/bin/sh
 
-set -e
-
-fusermount -u testmnt.txt
-rm testmnt.txt
+fusermount -u testmnt.txt && rm testmnt.txt