ci: fix QCBOR clone path

Update the QCBOR cloning path to create its instance within
the TF-A source code repository.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I9b9505f7362fabf76ce6c24415eaec98b48e79f3
diff --git a/script/tf-coverity/tf-cov-make b/script/tf-coverity/tf-cov-make
index 41ae76a..4005e2f 100755
--- a/script/tf-coverity/tf-cov-make
+++ b/script/tf-coverity/tf-cov-make
@@ -49,6 +49,8 @@
     git checkout main
 fi
 
+cd "$TF_SOURCES"
+
 if [ ! -d "$QCBOR_LIB_DIR" ]; then
     git clone "$QCBOR_URL_REPO" "$QCBOR_LIB_DIR"
     cd "$QCBOR_LIB_DIR"