scripts/run-sparse.sh: fix to exclude boringssl directory

Signed-off-by: Eric Biggers <ebiggers@google.com>
diff --git a/scripts/run-sparse.sh b/scripts/run-sparse.sh
index f75b837..b8d37c1 100755
--- a/scripts/run-sparse.sh
+++ b/scripts/run-sparse.sh
@@ -8,7 +8,7 @@
 
 set -e -u -o pipefail
 
-find . -name '*.c' | while read -r file; do
+find programs lib -name '*.c' | while read -r file; do
 	sparse "$file" -gcc-base-dir "$(gcc --print-file-name=)"	\
 		-Iinclude -D_FILE_OFFSET_BITS=64 -Wbitwise -D_GNU_SOURCE
 done