i2c: recovery: rename variable for easier understanding

While refactoring the routine before, it occurred to me that this will
make the code much easier to understand.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>