I run splint in gdb source and get the following warnings:
../../../git/gdb/corelow.c:740: Return value type int does not match declared type enum target_xfer_status: 0
'TARGET_XFER_EOF' (enum target_xfer_status) is expected to be returned,
but 0 is returned. This patch is to replace 0 with TARGET_XFER_EOF
in the implementations of to_xfer_partial.