Fix for bad error pointer *Dump'ing with a given start offset

Trying to dump a file larger than 2GB starting from an offset below 2GB would fail because the compare checking whether PTR#han > EXT#han accidentally set V which was taken as an error (but with R0 not really being an error block).

s/SysComms

@@ -1059,20 +1059,22 @@ Dump_Code Entry "$UtilRegs"
         ADD     r2, r3, r2              ; Display offset = disparm/loadaddr+ptr
 
 10      Swap    r2, r3                  ; r2 := start, r3 := disp start
-        CMP     r2, r4                  ; Is ptr > ext ? VClear
-        MOVHI   r1, r5
-        BLHI    SetErrorOutsideFile
+        CMP     r2, r4                  ; Is ptr > ext ?
+        MOV     r1, r5
+        BLS     %FT11
 
-        MOVVC   r0, #OSArgs_SetPTR
-        MOVVC   r1, r5
-        SWIVC   XOS_Args                ; PTR#r1 := start offset
+        BL      SetErrorOutsideFile
+        BVS     UtilityExitCloseR1
+11
+        MOV     r0, #OSArgs_SetPTR
+        SWI     XOS_Args                ; PTR#r1 := start offset
         MOVVC   r7, #0
 
         BLVC    ReadWindowWidth
         BVS     UtilityExitCloseR1
 
         SUB     r9, r0, #12+1           ; -ExtraFields (address and separators)
-        MOV     r9, r9, LSR #2   ; Two nibbles, one space and one char per byte
+        MOV     r9, r9, LSR #2          ; Two nibbles, one space and one char per byte
 
         Push    r10                     ; Save format bits
         MOV     r10, #(1 :SHL: 31)      ; Move 1 bit down until not zero