drivers/ps3: Fix double word in comments

Drop the repeated word "when" in comments.
Signed-off-by: Shaomin Deng <dengshaomin@cdjrlc.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220904155102.26957-1-dengshaomin@cdjrlc.com

drivers/ps3/ps3-lpm.c

@@ -1066,7 +1066,7 @@ EXPORT_SYMBOL_GPL(ps3_disable_pm_interrupts);
  *  instance, specified by one of enum ps3_lpm_tb_type.
  * @tb_cache: Optional user supplied buffer to use as the trace buffer cache.
  *  If NULL, the driver will allocate and manage an internal buffer.
- *  Unused when when @tb_type is PS3_LPM_TB_TYPE_NONE.
+ *  Unused when @tb_type is PS3_LPM_TB_TYPE_NONE.
  * @tb_cache_size: The size in bytes of the user supplied @tb_cache buffer.
  *  Unused when @tb_cache is NULL or @tb_type is PS3_LPM_TB_TYPE_NONE.
  */