imagemagick/encoder_b_fuzzer: Use-of-uninitialized-value in ReadBlobString

Project: https://github.com/imagemagick/imagemagick.git Detailed report: https://oss-fuzz.com/testcase?key=4831902440620032 Project: imagemagick Fuzzer: libFuzzerimagemagickencoderbfuzzer Fuzz target binary: encoderbfuzzer Job Type: libfuzzermsanimagemagick Platform Id: linux Crash Type:...