[mkfile mkpaqfs.c paqfs.c paqfs.h]
this fixes a checksum error caused by looking for the wrong tag

here's a test script

#!/bin/rc
rfork en
ramfs

cd /tmp
for(i in a b c d e f g h i j k l m n o p)
	touch `{dd -quiet 1 -if /dev/zero -count 1 | tr '\x00' $i}
mkpaqfs -o paq.paq
paqfs paq.paq
ls /n/paq > /dev/null

Reference: /n/sources/patch/applied/paqbigdir
Date: Fri Dec  7 19:23:21 CET 2012
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/paqfs/paqfs.c	Fri Dec  7 19:22:43 2012
+++ /sys/src/cmd/paqfs/paqfs.c	Fri Dec  7 19:22:42 2012
@@ -493,7 +493,7 @@
 			off = 0;
 			i++;
 			blockFree(b);
-			b = blockLoad(getl(ptr->data + i*4), DataBlock);
+			b = blockLoad(getl(ptr->data + i*4), DirBlock);
 		}
 	}
 	f->offset = i*blocksize + off;