of: module: remove strlen() call in of_modalias()

In of_modalias(), there's no dire need to call strlen() (and then add 1
to its result to account for the 'C' char preceding the compat string).
Replace that strlen() with snprintf() (currently below it) -- this way,
we always try to print the compat string but then only advance the str
and len parameters iff the compat string fit into the remaining buffer
space...

Signed-off-by: Sergey Shtylyov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>

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