Use gcc -ansi -pedantic in 9c. Fix many non-C89-isms.
diff --git a/src/cmd/dc.c b/src/cmd/dc.c
index daff401..bdcfade 100644
--- a/src/cmd/dc.c
+++ b/src/cmd/dc.c
@@ -2149,7 +2149,7 @@
lbytes += nn - hptr->last;
if(n > longest)
longest = n;
-/* free(hptr->beg); *//**/
+/* free(hptr->beg); */
p = realloc(hptr->beg, n);
if(p == 0) {
/* hptr->beg = realloc(hptr->beg, hptr->last-hptr->beg);
@@ -2194,7 +2194,7 @@
longest = size;
lbytes += size/2;
lmore++;
-/* free(hptr->beg);*//**/
+/* free(hptr->beg);*/
p = realloc(hptr->beg, size);
if(p == 0) {