gvpr endString: squash a -Wconversion waning

`c` is known to be '\\' here.

diff --git a/lib/gvpr/parse.c b/lib/gvpr/parse.c
index 32ac232384bdff37a7dc8d951c8f8dda44c4d225..2dc2592ea959789ddd0ff0aba3cb7d83b7b31c51 100644 (file)
--- a/lib/gvpr/parse.c
+++ b/lib/gvpr/parse.c
@@ -240,7 +240,7 @@ static int endString(Sfio_t * ins, agxbuf * outs, char ec)
 
     while ((c = sfgetc(ins)) != ec) {
        if (c == '\\') {
-           agxbputc(outs, c);
+           agxbputc(outs, (char)c);
            c = sfgetc(ins);
        }
        if (c < 0) {