Correction to the file and descriptor handling.

tests/Watchfd_-_Single_descriptor.test

@@ -3,7 +3,7 @@
 # Check that watching a single file descriptor works as expected.
 
 # Dummy assignments for "shellcheck".
-testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"; workFile2="${workFile1:-.tmp2}"
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"; workFile2="${workFile2:-.tmp2}"
 
 # Skip the test if "-d" is not available.
 if ! "${testSubject}" -h | grep -Fq ' -d'; then
@@ -18,6 +18,7 @@ seq 1 100 > "${workFile1}"
 (export line; sleep 1; read -r line; sleep 1; read -r line; sleep 1) <"${workFile1}" &
 pid=$!
 
+sleep 0.1
 "${testSubject}" -d "${pid}:0" -f -i 0.5 >/dev/null 2>"${workFile2}"
 
 # There should be at least 2 different numbers starting the output lines.