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i2c: core: Check for error pointer for fwnode
Theoretically it's possible that fwnode is returned by some API, that may return an error pointer (and we have, for example, fwnode_find_reference() which does that). If such an fwnode is supplied to the i2c core APIs the functions will perform unneeded loops and checks. Avoid this by preventively checking for an error pointer and bail out immediately. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
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