patch 8.2.1103: Coverity reports an unnecessary NULL check

Problem:    Coverity reports an unnecessary NULL check.
Solution:   Remove the check for NULL.
diff --git a/src/eval.c b/src/eval.c
index e6843cd..5a0aef2 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -5246,7 +5246,7 @@
     int		called_emsg_before = called_emsg;
     evalarg_T	evalarg;
 
-    fill_evalarg_from_eap(&evalarg, eap, eap != NULL && eap->skip);
+    fill_evalarg_from_eap(&evalarg, eap, eap->skip);
 
     if (eap->skip)
 	++emsg_skip;