Update md.asm

stack use cleanup

Source/HBIOS/md.asm

@@ -387,7 +387,6 @@ MD_CALBAS:
 #ENDIF
 ;
 	PUSH	HL
-	PUSH	BC
 	LD	A,E		; BOTTOM PORTION OF SECTOR
 	AND	$0F		; ADDRESS THAT GETS WRITTEN
 	RLC	H		; WITH ERASE COMMAND BYTE
@@ -408,7 +407,6 @@ MD_CALBAS:
 	CALL	PC_SPACE	; SECTOR RESULT
 #ENDIF
 ;
-	POP	BC
 	RET
 ;
 ; WRITE FLASH
@@ -436,9 +434,6 @@ MD_SECM1:				; DESIRED SECTOR IS IN BUFFER
 	CALL	MD_FNCALL		; EXECUTE: ERASE 4K SECTOR
 	OR	A
 	RET	NZ			; RETURN IF ERROR
-;
-	PUSH	HL
-	PUSH	DE
 	;
 	; COPY 512B SECTOR INTO 4K SECTOR
 	;
@@ -455,9 +450,6 @@ MD_SECM1:				; DESIRED SECTOR IS IN BUFFER
 	LD	HL,(MD_DSKBUF)
 	LD	BC,512			; COPY ONE 512B SECTOR FROM THE
 	LDIR				; THE DISK BUFFER TO 4K SECTOR
-;
-	POP	DE
-	POP	HL
 ;
 	LD	IX,MD_F4KBUF		; SET SOURCE ADDRESS
 	LD	BC,MD_FWRIT_R		; PUT ROUTINE TO CALL