fix this code properly. msdosfs can't have device nodes on them.

comment how to read device nodes from ufs (if an adventurous soul wants
to fix it!).

Reviewed by:	bde

usr.bin/fstat/cd9660.c

@@ -70,7 +70,7 @@ isofs_filestat(vp, fsp)
 	}
 	fsp->fsid = dev2udev(isonode.i_dev);
 	fsp->mode = (mode_t)isonode.inode.iso_mode;
-	fsp->rdev = isonode.i_dev;
+	fsp->rdev = isonode.inode.iso_rdev;
 
 	fsp->fileid = (long)isonode.i_number;
 	fsp->size = (u_long)isonode.i_size;

usr.bin/fstat/fstat.c

@@ -594,7 +594,11 @@ ufs_filestat(vp, fsp)
 	fsp->mode = (mode_t)inode.i_mode;
 	fsp->size = (u_long)inode.i_size;
 #if should_be_but_is_hard
-	fsp->rdev = inode.i_rdev;
+	/* XXX - need to load i_ump and i_din[12] from kernel memory */
+	if (inode.i_ump->um_fstype == UFS1)
+		fsp->rdev = inode.i_din1->di_rdev;
+	else
+		fsp->rdev = inode.i_din2->di_rdev;
 #else
 	fsp->rdev = 0;
 #endif

usr.bin/fstat/msdosfs.c

@@ -120,7 +120,7 @@ msdosfs_filestat(vp, fsp)
 	fsp->mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG;
 
 	fsp->size = denode.de_FileSize;
-	fsp->rdev = denode.de_dev;
+	fsp->rdev = 0;
 
 	/*
 	 * XXX -