dvd+rw-tools: growisofs exit code

[A E Lawrence <A.E.Lawrence@lboro.ac.uk>]

dvd+rw-tools, version 5.16
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Exit status of growisofs
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I executed 
growisofs -Z /dev/dvd=file
in a bash script, and there was a failure as below:-

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Executing 'builtin_dd if=file_container of=/dev/dvdrw obs=32k seek=0'
/dev/dvdrw: FEATURE 21h is not on, engaging DAO...
/dev/dvdrw: reserving 1802560 blocks
/dev/dvdrw: "Current Write Speed" is 1.0x1385KBps.
   1605632/3691623424 ( 0.0%) @0.3x, remaining 191:30
   1605632/3691623424 ( 0.0%) @0.0x, remaining 344:43

[..snip..]

2509078528/3691623424 (68.0%) @0.0x, remaining 14:45
2509078528/3691623424 (68.0%) @0.0x, remaining 14:46
2509078528/3691623424 (68.0%) @0.0x, remaining 14:48
2509078528/3691623424 (68.0%) @0.0x, remaining 14:50
2509078528/3691623424 (68.0%) @0.0x, remaining 14:51
2509078528/3691623424 (68.0%) @0.0x, remaining 14:53
:-[ WRITE@LBA=12b1b0h failed with SK=5h/ASC=21h/ACQ=02h]: Invalid argument
builtin_dd: 1225136*2KB out
:-( write failed: Invalid argument

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The exit status seemed not to signal the error. I had a quick look at
the source, but couldn't see where this error message was produced, and
thus how the exit status was set in this case.

Shouldn't it return exit(1) or at least non zero in this case?

ael