msi: Fix typos which caused joins of three or more tables to not work properly.

[Robert Shearman]

In JOIN_fetch_int and JOIN_fetch_stream, prev_rows should be multiplied 
by the rows encountered in the current table so that prev_rows contains 
all of counts of the rows encountered multiplied together, rather than 
just the count of the rows in the last table encountered.
---
  dlls/msi/join.c |    4 ++--
  1 files changed, 2 insertions(+), 2 deletions(-)
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