ACPI / processor: Remove redundant NULL check before kfree

kfree() on a NULL pointer is a no-op, so remove a redundant NULL
pointer check in map_mat_entry().

[rjw: Changelog]
Signed-off-by: Syam Sidhardhan <s.syam@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/processor_core.c

@@ -158,7 +158,6 @@ static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 	}
 
 exit:
-	if (buffer.pointer)
 	kfree(buffer.pointer);
 	return apic_id;
 }