spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op()

In the Linux kernel, the following vulnerability has been resolved:

spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op()

In zynq_qspi_exec_mem_op(), kzalloc() is directly used in memset(),

which could lead to a NULL pointer dereference on failure of

kzalloc().

Fix this bug by adding a check of tmpbuf.

This bug was found by a static analyzer. The analysis employs

differential checking to identify inconsistent security operations

(e.g., checks or kfrees) between two code paths and confirms that the

inconsistent operations are not recovered in the current function or

the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false

positive or hard to trigger. Multiple researchers have cross-reviewed

the bug.

Builds with CONFIG_SPI_ZYNQ_QSPI=m show no new warnings,

and our static analyzer no longer warns about this code.