Fixed a bug

git-svn-id: svn://svn.cc65.org/cc65/trunk@3458 b7a2c559-68d2-44c3-8de9-860c34a00d81

diff --git a/src/ca65/studyexpr.c b/src/ca65/studyexpr.c
index 2fafda9343840b8c5199ed6c666214f4b0cc9c6c..407862a172d779f507a7470ec17b6b9879a0a0b8 100644 (file)
--- a/src/ca65/studyexpr.c
+++ b/src/ca65/studyexpr.c
@@ -619,7 +619,7 @@ static void StudyPlus (ExprNode* Expr, ExprDesc* D)
     StudyExprInternal (Expr->Right, &Right);
 
     /* Check if we can handle the operation */
-    if (ED_IsValid (D) || ED_IsValid (&Right)) {
+    if (ED_IsValid (D) && ED_IsValid (&Right)) {
 
         /* Add both */
         ED_Add (D, &Right);
@@ -654,7 +654,7 @@ static void StudyMinus (ExprNode* Expr, ExprDesc* D)
     StudyExprInternal (Expr->Right, &Right);
 
     /* Check if we can handle the operation */
-    if (ED_IsValid (D) || ED_IsValid (&Right)) {
+    if (ED_IsValid (D) && ED_IsValid (&Right)) {
 
         /* Subtract both */
         ED_Sub (D, &Right);