Pass -f to rm in cleanup handlers

When a test fails, some of the files the cleanup handler needs to remove
may not have been created, so pass -f to rm to ignore nonexistent files.

tests/test_cmd_animation.sh

diff --git a/tests/test_cmd_animation.sh b/tests/test_cmd_animation.sh
index 58a7455..07bf85b 100755
--- a/tests/test_cmd_animation.sh
+++ b/tests/test_cmd_animation.sh
@@ -47,7 +47,7 @@
 
 cleanup() {
   pushd ${TMP_DIR}
-    rm -- "${ENCODED_FILE}" "${DECODED_FILE}" "${ERROR_MSG}"
+    rm -f -- "${ENCODED_FILE}" "${DECODED_FILE}" "${ERROR_MSG}"
   popd
 }
 trap cleanup EXIT

tests/test_cmd_grid.sh

diff --git a/tests/test_cmd_grid.sh b/tests/test_cmd_grid.sh
index 2dd6aae..cfff1bc 100755
--- a/tests/test_cmd_grid.sh
+++ b/tests/test_cmd_grid.sh
@@ -54,9 +54,9 @@
 # Cleanup
 cleanup() {
   pushd ${TMP_DIR}
-    rm -- "${ENCODED_FILE}" "${DECODED_FILE}" \
-          "${ENCODED_FILE_2x2}" "${DECODED_FILE_2x2}" \
-          "${ENCODED_FILE_7x5}" "${DECODED_FILE_7x5}"
+    rm -f -- "${ENCODED_FILE}" "${DECODED_FILE}" \
+             "${ENCODED_FILE_2x2}" "${DECODED_FILE_2x2}" \
+             "${ENCODED_FILE_7x5}" "${DECODED_FILE_7x5}"
   popd
 }
 trap cleanup EXIT

tests/test_cmd_icc_profile.sh

diff --git a/tests/test_cmd_icc_profile.sh b/tests/test_cmd_icc_profile.sh
index 166cafa..b514631 100755
--- a/tests/test_cmd_icc_profile.sh
+++ b/tests/test_cmd_icc_profile.sh
@@ -55,7 +55,7 @@
 # Cleanup
 cleanup() {
   pushd ${TMP_DIR}
-    rm -- "${ENCODED_FILE}" "${DECODED_FILE}" "${CORRECTED_FILE}"
+    rm -f -- "${ENCODED_FILE}" "${DECODED_FILE}" "${CORRECTED_FILE}"
   popd
 }
 trap cleanup EXIT

tests/test_cmd_lossless.sh

diff --git a/tests/test_cmd_lossless.sh b/tests/test_cmd_lossless.sh
index 44dd012..d81a650 100755
--- a/tests/test_cmd_lossless.sh
+++ b/tests/test_cmd_lossless.sh
@@ -52,7 +52,7 @@
 # Cleanup
 cleanup() {
   pushd ${TMP_DIR}
-    rm -- "${ENCODED_FILE}" "${DECODED_FILE}" "${DECODED_FILE_LOSSLESS}"
+    rm -f -- "${ENCODED_FILE}" "${DECODED_FILE}" "${DECODED_FILE_LOSSLESS}"
   popd
 }
 trap cleanup EXIT

tests/test_cmd_metadata.sh

diff --git a/tests/test_cmd_metadata.sh b/tests/test_cmd_metadata.sh
index cfbd9fc..e9c65ba 100755
--- a/tests/test_cmd_metadata.sh
+++ b/tests/test_cmd_metadata.sh
@@ -54,8 +54,9 @@
 # Cleanup
 cleanup() {
   pushd ${TMP_DIR}
-    rm -- "${ENCODED_FILE}" "${ENCODED_FILE_NO_METADATA}" "${ENCODED_FILE_MORE_METADATA}" \
-          "${DECODED_FILE}" "${DECODED_FILE_CHANGED_ICC}"
+    rm -f -- "${ENCODED_FILE}" "${ENCODED_FILE_NO_METADATA}" \
+             "${ENCODED_FILE_MORE_METADATA}" \
+             "${DECODED_FILE}" "${DECODED_FILE_CHANGED_ICC}"
   popd
 }
 trap cleanup EXIT

tests/test_cmd_targetsize.sh

diff --git a/tests/test_cmd_targetsize.sh b/tests/test_cmd_targetsize.sh
index 8b00137..095cabf 100755
--- a/tests/test_cmd_targetsize.sh
+++ b/tests/test_cmd_targetsize.sh
@@ -49,7 +49,8 @@
 # Cleanup
 cleanup() {
   pushd ${TMP_DIR}
-    rm -- "${ENCODED_FILE}" "${DECODED_SMALLEST_FILE}" "${DECODED_BIGGEST_FILE}"
+    rm -f -- "${ENCODED_FILE}" "${DECODED_SMALLEST_FILE}" \
+             "${DECODED_BIGGEST_FILE}"
   popd
 }
 trap cleanup EXIT