clk: no need to check return value of debugfs_create functions

Status from this message: Applied to clk-next

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#	Subject and files	Size	Replies
1/5	clk: no need to check return value of debugfs_create functions`drivers/clk/clk.c`	+30 ~~-99~~	2 replies
2/5	clk: bcm2835: no need to check return value of debugfs_create functions`drivers/clk/bcm/clk-bcm2835.c`	+2 -4	2 replies
3/5	clk: davinci: no need to check return value of debugfs_create functions`drivers/clk/davinci/pll.c`	+1 -6	2 replies
4/5	clk: tegra: no need to check return value of debugfs_create functions`drivers/clk/tegra/clk-dfll.c`	+11 ~~-31~~	1 reply
5/5	clk: remove clk_debugfs_add_file()`drivers/clk/clk.c` `include/linux/clk-provider.h`	+0 ~~-18~~	1 reply

2 of 5 patches have a Reviewed-by or Acked-by.

Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.