Signatures: change param count from IV to UV

For some reason I was storing the counts of sub signature parameters and
optional parameters as signed ints. Since these can never be negative,
change them to UV instead.

1 files changed, 2 insertions, 2 deletions

diff --git a/op.h b/op.h
index 7444965274..80b1d9c59c 100644
--- a/op.h
+++ b/op.h
@@ -1116,8 +1116,8 @@ C<sib> is non-null. For a higher-level interface, see C<L</op_sibling_splice>>.
 /* stuff for OP_ARGCHECK */
 
 struct  op_argcheck_aux {
-    IV   params;     /* number of positional parameters */
-    IV   opt_params; /* number of optional positional parameters */
+    UV   params;     /* number of positional parameters */
+    UV   opt_params; /* number of optional positional parameters */
     char slurpy;     /* presence of slurpy: may be '\0', '@' or '%' */
 };