[REG 6.2 -> 6.3] Crash in QSslCertificate

1. Have a build of qtbase configured with "-sanitize address" and using OpenSSL.
2. Build the attached project.

   qt-cmake -S /tmp/report/ && cmake --build .
   

3. Run the resulting program.
   The address sanitizer reports:

   AddressSanitizer:DEADLYSIGNAL
   =================================================================
   ==83765==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0x000000a6524b bp 0x7ffd99a8a3d0 sp 0x7ffd99a8a370 T0)
   ==83765==The signal is caused by a READ memory access.
   ==83765==Hint: address points to the zero page.
       #0 0xa6524b in auto QtPrivate::sequential_erase<QList<QFactoryLoader*>, QFactoryLoader*>(QList<QFactoryLoader*>&, QFactoryLoader* const&) (/tmp/build-report/report+0xa6524b)
       #1 0xa5ef16 in QFactoryLoader::~QFactoryLoader() (/tmp/build-report/report+0xa5ef16)
       #2 0x123bfdd in QtGlobalStatic::ApplicationHolder<(anonymous namespace)::Q_QAS_loader>::~ApplicationHolder() (/tmp/build-report/report+0x123bfdd)
       #3 0x7fef5bc58a26 in __run_exit_handlers /build/glibc-eX1tMB/glibc-2.31/stdlib/exit.c:108:8
       #4 0x7fef5bc58bdf in exit /build/glibc-eX1tMB/glibc-2.31/stdlib/exit.c:139:3
       #5 0x7fef5bc360b9 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:342:3
       #6 0x4279fd in _start (/tmp/build-report/report+0x4279fd)
   
   AddressSanitizer can not provide additional info.
   SUMMARY: AddressSanitizer: SEGV (/tmp/build-report/report+0xa6524b) in auto QtPrivate::sequential_erase<QList<QFactoryLoader*>, QFactoryLoader*>(QList<QFactoryLoader*>&, QFactoryLoader* const&)
   ==83765==ABORTING
   

Google's oss-fuzz found this as issue 43778. The attached detailed report provides further information.