tests: Fix paths for testsuite

make distcheck gets confused what is in srcdir and what is in
topdir

Signed-off-by: Craig Small <csmall@dropbear.xyz>

testsuite/lib.test/fileutils.exp

@@ -8,12 +8,12 @@ set test "without argument"
 spawn $noarg
 expect_pass "$test" "Hello, World!"
 
-set badfd "${topdir}testsuite/lib.test/fileutils_badfd.sh"
+set badfd "${srcdir}/lib.test/fileutils_badfd.sh"
 set test "test bad file descriptor"
 spawn $badfd
 expect_pass "$test" "test_fileutils: write error: Bad file descriptor"
 
-set full "${topdir}testsuite/lib.test/fileutils_full.sh"
+set full "${srcdir}/lib.test/fileutils_full.sh"
 set test "test no space left on device"
 spawn $full
 expect_pass "$test" "test_fileutils: write error: No space left on device"

testsuite/lib.test/fileutils_badfd.sh

@@ -1,4 +1,3 @@
 #!/bin/sh
 
-BASEDIR=$(dirname ${0})
-${BASEDIR}/../../lib/test_fileutils >&-
+${PWD}/../lib/test_fileutils >&-

testsuite/lib.test/fileutils_full.sh

@@ -1,4 +1,3 @@
 #!/bin/sh
 
-BASEDIR=$(dirname ${0})
-${BASEDIR}/../../lib/test_fileutils > /dev/full
+${PWD}/../lib/test_fileutils > /dev/full