AddressSanitizer: fix allocating too big buffers (libjpeg-turbo)

[dwrobel]

Fixex attempt to allocate 0xffffffff833db0fe bytes of data:

==18628==WARNING: AddressSanitizer failed to allocate 0xffffffff833db0fe bytes
==18628==AddressSanitizer CHECK failed: ../../../../libsanitizer/sanitizer_common/sanitizer_allocator.cc:218 "((0)) != (0)" (0x0, 0x0)
#0 0x7f939d46a902 (/lib64/libasan.so.4+0xe9902)
#1 0x7f939d489295 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) (/lib64/libasan.so.4+0x108295)
#2 0x7f939d470042 (/lib64/libasan.so.4+0xef042)
#3 0x7f939d3a8b46 (/lib64/libasan.so.4+0x27b46)
#4 0x7f939d45f81a in malloc (/lib64/libasan.so.4+0xde81a)
#5 0x81fc71 in pxLoadJPGImageTurbo(char const*, unsigned long, pxOffscreen&) pxCore/src/pxUtil.cpp:711
#6 0x81dea4 in pxLoadImage(char const*, unsigned long, pxOffscreen&) pxCore/src/pxUtil.cpp:49
#7 0x63a942 in pxUtilTest::pxLoadImage3ArgsLessLengthFailureTest() pxCore/tests/pxScene2d/test_pxUtil.cpp:142
#8 0x638975 in pxUtilTest_pxutilsTest_Test::TestBody() pxCore/tests/pxScene2d/test_pxUtil.cpp:327
#9 0x7ad278 in void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::)(), char const) (pxCore/tests/pxScene2d/pxscene2dtests+0x7ad278)
#10 0x7a0938 in void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::)(), char const) pxCore/tests/pxScene2d/../../examples/pxScene2d/external/gtest/googletest/src/gtest.cc:2438
#11 0x75d4cd in testing::Test::Run() pxCore/tests/pxScene2d/../../examples/pxScene2d/external/gtest/googletest/src/gtest.cc:2474
#12 0x75e7b9 in testing::TestInfo::Run() pxCore/tests/pxScene2d/../../examples/pxScene2d/external/gtest/googletest/src/gtest.cc:2656
#13 0x75f332 in testing::TestCase::Run() pxCore/tests/pxScene2d/../../examples/pxScene2d/external/gtest/googletest/src/gtest.cc:2774
#14 0x76fed0 in testing::internal::UnitTestImpl::RunAllTests() pxCore/tests/pxScene2d/../../examples/pxScene2d/external/gtest/googletest/src/gtest.cc:4649
#15 0x7afcb7 in bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::)(), char const) pxCore/tests/pxScene2d/../../examples/pxScene2d/external/gtest/googletest/src/gtest.cc:2402
#16 0x7a2a97 in bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::)(), char const) (pxCore/tests/pxScene2d/pxscene2dtests+0x7a2a97)
#17 0x76d0d9 in testing::UnitTest::Run() pxCore/tests/pxScene2d/../../examples/pxScene2d/external/gtest/googletest/src/gtest.cc:4257
#18 0x5299db in RUN_ALL_TESTS() (pxCore/tests/pxScene2d/pxscene2dtests+0x5299db)
#19 0x5295c7 in main pxCore/tests/pxScene2d/pxscene2dtestsmain.cpp:101
#20 0x7f9397692009 in __libc_start_main (/lib64/libc.so.6+0x21009)
#21 0x5293c9 in _start (pxCore/tests/pxScene2d/pxscene2dtests+0x5293c9)

[codecov]

Codecov Report

Merging #893 into master will decrease coverage by 0.05%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #893      +/-   ##
==========================================
- Coverage   65.73%   65.68%   -0.06%     
==========================================
  Files         129      129              
  Lines       16984    16992       +8     
==========================================
- Hits        11165    11161       -4     
- Misses       5819     5831      +12

Impacted Files	Coverage Δ
src/pxUtil.cpp	82.55% <66.66%> (-1.28%)	⬇️
src/rtMutex.h	66.66% <0%> (-33.34%)	⬇️
examples/pxScene2d/src/pxContextGL.cpp	74.6% <0%> (-0.16%)	⬇️
examples/pxScene2d/src/pxScene2d.cpp	72.24% <0%> (-0.06%)	⬇️

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