Minor change to be clean on integer sanitization

The idiom `while(x--) {` will decrement x through 0, triggering the
overflow sanitizer. Using for(; x > 0; x--) is equivalent if the
variable is not used afterwards.

Bug: 129300035
Change-Id: I32b170a45fdca5c0940de0924e16a7e813cbb8a0
1 file changed