bridge: fix error handling in br_add_if()

Status from this message: Applied.

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#	Subject and files	Size	Replies	Applied
1/2	bridge: fix error handling in br_add_if()`net/bridge/br_if.c`	+4 -1	1 reply
2/2	bridge: kernel panic when unloading bridge module`net/bridge/br.c`	+1 -1	1 reply

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