powerpc/perf: Replace the direct return with goto statement

Replace the direct return statement in imc_mem_init() with goto, to adhere
to the kernel coding style.

Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Reviewed-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>