stagefiles: refactor Require_stagefile()

 - count of params is available as $#, we don't need the pipe-to-wc logic.
 - the whole 'CONTINUE' based logic is silly, we can just return once one
   of the files is found.
 - setting of 'NAME' in the loop was completely pointless.
 - the error message for multiple files was not very clear just injecting
   a sequence of words into a sentence.
 - it did not work correctly if no arguments were given (bad usage)

note, you might question whether the functionality of this function is
correct, as did I; this is tackled in a followup commit whilst this
commit retains the existing functionality!

Gbp-Dch: Short

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