i2c: sh_mobile: cosmetic: trivially simplify 2 functions

Reduce 2 boolean functions from "if (condition) return 1; return 0;" to
"return condition;"

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Wolfram Sang <wolfram@the-dreams.de>