Remove newline at end of warning message

... to fix this ARI warning:

  gdb/csky-tdep.c:1612: gettext: trailing new line: A message should not have a trailing new line
  gdb/csky-tdep.c:1612:    warning (_("Invalid breakpoint address 0x%x is an odd number.\n"),

gdb/ChangeLog:

	* csky-tdep.c (csky_memory_insert_breakpoint): Remove newline at
	end of warning message.