Silent build failure

[jbush001]

https://travis-ci.org/jbush001/NyuziProcessor/builds/360718083

Related to #161. In this case, one build of the resource file fails, but the build is successful:

[ 98%] Creating filesystem image
error reading from source file: Success
first file offset = 512
Adding resource.bin 00000200 011e2874
software/apps/sceneview/CMakeFiles/sceneview_fsimage.dir/build.make:61: recipe for target 'software/apps/sceneview/fsimage.bin' failed
make[2]: *** [software/apps/sceneview/fsimage.bin] Error 1
make[2]: *** Deleting file 'software/apps/sceneview/fsimage.bin'
CMakeFiles/Makefile2:1027: recipe for target 'software/apps/sceneview/CMakeFiles/sceneview_fsimage.dir/all' failed
make[1]: *** [software/apps/sceneview/CMakeFiles/sceneview_fsimage.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Other odd stuff going on:

• printed an error from mkfs, but perror prints 'success'.
• Then it seems to continue writing the file: first file offset = 512

Perhaps two instances are running concurrently.

[jbush001]

Duplicate of #161