perf/x86/rapl: Prefer struct_size() over open coded arithmetic

This is an effort to get rid of all multiplications from allocation
functions in order to prevent integer overflows:

  https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
  https://github.com/KSPP/linux/issues/160

As the "rapl_pmus" variable is a pointer to "struct rapl_pmus" and
this structure ends in a flexible array:

  struct rapl_pmus {
	[...]
	struct rapl_pmu *pmus[] __counted_by(maxdie);
  };

the preferred way in the kernel is to use the struct_size() helper to
do the arithmetic instead of the calculation "size + count * size" in
the kzalloc() function.

This way, the code is more readable and safer.

Signed-off-by: Erick Archer <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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