-Werror,-Wconstant-conversion (from 255 to -1)

Change-Id: I9cce09bf729398a475d9d07fdfa002f325611546
diff --git a/rsc/source/rscpp/cpp4.c b/rsc/source/rscpp/cpp4.c
index 5d1cf7d..98ec8a3 100644
--- a/rsc/source/rscpp/cpp4.c
+++ b/rsc/source/rscpp/cpp4.c
@@ -277,7 +277,7 @@ void stparmscan(int delim)
        {
#ifdef SOLAR
            *wp++ = DEL;
            *wp++ = MAC_PARM + PAR_MAC;     /* Stuff a magic marker */
            *wp++ = (char)(MAC_PARM + PAR_MAC); /* Stuff a magic marker */
            *wp++ = (char)(i + MAC_PARM);   /* Make a formal marker */
            *wp = wp[-4];                   /* Add on closing quote */
            workp = wp + 1;                 /* Reset string end     */