bootstrap: fix shellcheck warnings

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I86ef079c9632e5563a1a56d6a2e23aad59ecbc57
diff --git a/bootstrap.sh b/bootstrap.sh
index 9e232b6..3112382 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -18,7 +18,7 @@
     clean)
         test -f Makefile && make maintainer-clean
         for file in ${AUTOCONF_FILES}; do
-            find -name "$file" | xargs -r rm -rf
+            find . -name "$file" -print0 | xargs -0 -r rm -rf
         done
         exit 0
         ;;
@@ -28,6 +28,7 @@
 
 case ${BOOTSTRAP_MODE} in
     dev)
+        # shellcheck disable=SC2086 # CONFIGURE_FLAGS is intentionally split.
         ./configure \
             ${CONFIGURE_FLAGS} \
             --enable-code-coverage \
@@ -35,6 +36,7 @@
             "$@"
         ;;
     *)
+        # shellcheck disable=SC2016
         echo 'Run "./configure ${CONFIGURE_FLAGS} && make"'
         ;;
 esac