[PATCH] fix OF_finddevice return value checks on sparc64

[Jayachandran C.]

While going thru the OF_finddevice usage in kernel (to fix up the FDT
interface) I noticed that  a few calls made to OF_finddevice in
sparc64 does not check the return value correctly.

The error return is -1 not 0, and since the value is unsigned,
checking it for '< 0' does not work either.  The attached patch fixes
this.

Regards,
JC.
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