patch 8.2.0254: compiler warning for checking size_t to be negative

Problem:    Compiler warning for checking size_t to be negative.
Solution:   Only check for zero. (Zoltan Arpadffy)
diff --git a/src/version.c b/src/version.c
index 0499e5d..dc3d163 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    254,
+/**/
     253,
 /**/
     252,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index c6201be..4413a51 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -138,7 +138,7 @@
 {
     int	    idx;
 
-    if (len <= 0)
+    if (len == 0)
 	return -1;
     for (idx = 0; idx < cctx->ctx_locals.ga_len; ++idx)
     {
@@ -160,7 +160,7 @@
 {
     int	    idx;
 
-    if (len <= 0)
+    if (len == 0)
 	return -1;
     for (idx = 0; idx < cctx->ctx_ufunc->uf_args.ga_len; ++idx)
     {