patch 8.2.0187: reduntant code

Problem:    Reduntant code.
Solution:   Remove unused assignments. (Dominique Pelle, closes #5557)
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 69a2d1b..fe83648 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -1653,7 +1653,7 @@
 compile_call(char_u **arg, size_t varlen, cctx_T *cctx, int argcount_init)
 {
     char_u	*name = *arg;
-    char_u	*p = *arg + varlen + 1;
+    char_u	*p;
     int		argcount = argcount_init;
     char_u	namebuf[100];
     ufunc_T	*ufunc;
@@ -2058,7 +2058,6 @@
     int		ret;
     char_u	*name;
 
-    start = *arg;
     ++*arg;
     len = get_env_len(arg);
     if (len == 0)