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test-theme: Check return value of chdir()

Will Thompson requested to merge wjt/gnome-shell:st-test-theme-chdir-warning into master

I noticed the following warning while building the .deb package for gnome-shell on Endless OS:

  ../src/st/test-theme.c: In function ‘main’:
  ../src/st/test-theme.c:549:3: warning: ignoring return value of ‘chdir’, declared with attribute warn_unused_result [-Wunused-result]
     chdir (cwd);
     ^~~~~~~~~~~

(Of course this is very unlikely to fail in practice.)

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