[Bug-ddrescue] GNU ddrescue 1.19-rc1 released data preview option bug

[Scott Dwyer]

The new "-P, --data-preview[=<lines>]" does not allow for a space 
between the "-P" and the variable. Every other option I have ever tested 
has always allowed for a space after the short name. Example: "-P20" 
will show 20 lines, "-P 20" will give "No data available".

Not a deal breaker, but it is not consistent with what I have 
experienced with all other options.

Scott