all functions returning char in A now have X cleared

git-svn-id: svn://svn.cc65.org/cc65/trunk@1868 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/geos/disk/dio_write.s

@@ -9,7 +9,7 @@
 ; sectnum_t - 16bit
 ;
 
-	.import		dio_params, __oserror
+	.import		dio_params, setoserror
  	.export		_dio_write
 	.include "../inc/geossym.inc"
 	.include "../inc/jumptab.inc"
@@ -18,8 +18,6 @@
 
 	jsr dio_params
 	jsr WriteBlock
-	stx __oserror
-	txa
-	rts
+	jmp setoserror
 
 .endproc