ssrc/marpaESLIf.c: Fix signed/unsigned mismatch [ci skip]
ssrc/marpaESLIf.c: Fix signed/unsigned mismatch [ci skip]

jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF