Remove a spurious warning as x is always initialised before use.
Remove a spurious warning as x is always initialised before use.

es137x.c: In function `es1371_rdcd':
es137x.c:598: warning: `x' might be used uninitialized in this function

PR:		kern/35408
Submitted by:	Thomas Quinot <thomas@cuivre.fr.eu.org>

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