fixed RSSTAT usage conflict

c64/kernal/vector_real.s

@@ -1,10 +1,9 @@
 
 vector_real:
 
-	// Temporary storage location - checked on real C64 that this is the
+	// Use MEMUSS as temporary storage location - checked on real C64 that this is the
 	// address originally used; after calling VECTOR and checking zero page
 	// area afterwards, the address could be found there
-	.label _caller_arr_ptr = MEMUSS
 
 	// According to 'Compute's Mapping the Commodore 64' page 237,
 	// the CBM implementation does not disable IRQs - yet, the
@@ -17,20 +16,20 @@ vector_real:
 	
 	// Prepare the user data pointer - strange order to reduce risk
 	// of potential similarity to the original routine
-	sty _caller_arr_ptr + 1
-	stx _caller_arr_ptr + 0
+	sty MEMUSS + 1
+	stx MEMUSS + 0
 	
 	// Select routine variant - store or restore vectors
 	ldy #$1F
 	bcc vector_restore
 	
 	lda CINV, y
-	sta (_caller_arr_ptr), y
+	sta (MEMUSS), y
 
 	bcs vector_end_loop // branch always
 	
 vector_restore:
-	lda (_caller_arr_ptr), y
+	lda (MEMUSS), y
 	sta CINV, y
 
 	// FALLTROUGH