Fixed script syntax error.

QHAlphaBuild.sh

@@ -20,12 +20,12 @@ do
 done
 
 if [ $release != "a" -a $release != "b" -a $release != "r" ]
+then
   echo >&2 \
   "Release must be 'a', 'b' or 'r'."
   echo >&2 \
   "usage: $0 [-release a|b|r] [-version some_repository_version] [-issue an_issue_number] [-branch trunk|some_branch]"
   exit 1
-then
 fi
 
 if [ -n $version -a $version -eq $version 2> /dev/null ]