Zero jpeg_decompress_struct before calling jpeg_calc_output_dimensions().

https://uberchromegw.corp.google.com/i/client.skia/builders/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-Valgrind/builds/38/steps/dm/logs/stdio

(Must have been https://codereview.chromium.org/1076923002 ?)

BUG=skia:

Review URL: https://codereview.chromium.org/1094603002
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