[PATCH]: Fix memory leak in diff

One of my users noticed that if you specify files seperately to svn
diff, the memory usage goes through the roof.

IE if you do svn diff *.c */*.c on a gcc checkout in the gcc dir, it
uses more than 300 meg of memory.

This is caused by not actually passing the per-iteration pool to our
children.
Fixed.

I also renamed subpool to iterpool by request of Erik, since it is
really cleared every iteration, and renaming it makes this clearer.

[[[

Fix memory leak when diff is given multiple files on the command line.

* subversion/clients/cmdlne/diff-cmd.c
  (svn_cl__diff): Rename subpool to iterpool.
  Pass iterpool to children, instead of pool.

]]]

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