Do not report size of the object that cannot be written in local-pull.c

Do not report size of the object that cannot be written in local-pull.c

Reporting st.st_size with %ld is simply wrong, as H Peter Anvin
says.  No other pull drivers report the failure with size
anyway, so yank it out.  This is a cop-out patch but should be
good enough.

Signed-off-by: Junio C Hamano <junkio@cox.net>