Fix some commonly made spelling errors in comments.

src/ca65/expr.c

@@ -1708,7 +1708,7 @@ ExprNode* GenLiteralExpr (long Val)
 
 
 ExprNode* GenLiteral0 (void)
-/* Return an expression tree that encodes the the number zero */
+/* Return an expression tree that encodes the number zero */
 {
     return GenLiteralExpr (0);
 }

src/ca65/expr.h

@@ -81,7 +81,7 @@ ExprNode* GenLiteralExpr (long Val);
 /* Return an expression tree that encodes the given literal value */
 
 ExprNode* GenLiteral0 (void);
-/* Return an expression tree that encodes the the number zero */
+/* Return an expression tree that encodes the number zero */
 
 ExprNode* GenSymExpr (struct SymEntry* Sym);
 /* Return an expression node that encodes the given symbol */

src/ca65/lineinfo.c

@@ -429,7 +429,7 @@ void ReleaseFullLineInfo (Collection* LineInfos)
 
     /* Walk over all entries */
     for (I = 0; I < CollCount (LineInfos); ++I) {
-        /* Release the the line info */
+        /* Release the line info */
         ReleaseLineInfo (CollAt (LineInfos, I));
     }
 

src/ca65/macro.c

@@ -637,7 +637,7 @@ void MacUndef (const StrBuf* Name, unsigned char Style)
 
 
 static int MacExpand (void* Data)
-/* If we're currently expanding a macro, set the the scanner token and
+/* If we're currently expanding a macro, set the scanner token and
 ** attribute to the next value and return true. If we are not expanding
 ** a macro, return false.
 */

src/ca65/studyexpr.c

@@ -711,7 +711,7 @@ static void StudyMul (ExprNode* Expr, ExprDesc* D)
     */
     if (ED_IsConst (D) && ED_IsValid (&Right)) {
 
-        /* Multiplicate both, result goes into Right */
+        /* Multiply both, result goes into Right */
         ED_Mul (&Right, D);
 
         /* Move result into D */
@@ -719,7 +719,7 @@ static void StudyMul (ExprNode* Expr, ExprDesc* D)
 
     } else if (ED_IsConst (&Right) && ED_IsValid (D)) {
 
-        /* Multiplicate both */
+        /* Multiply both */
         ED_Mul (D, &Right);
 
     } else {