Ivan Grokhotkov 1d44e40fb1 hal: spi_flash: avoid calling memcpy with NULL buffer ...

In practice, calling memcpy with NULL buffer and 0 size works on the
ESP32, but the C standard considers this an undefined behavior.
When building with UBSAN checks enabled, compiler will insert a check
that memcpy argument is non-NULL, regardless of the size argument.

This caused a failure in tools/test_apps/system/panic, which is built
with USBAN enabled for several components.

2021-07-09 11:24:25 +02:00

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