up_session: Silence coverity warning

Coverity complains about a supposedly missing NULL check for the pointer 'pdr', that check
however happens before the function in question is called.

It makes sense to be consistent inside the function, so remove the NULL check before calling
'pdr_del', because we don't NULL check anywhere else in the function either.

Fixes: Coverity scan CID#307494
Change-Id: Ia33e4211b4a24abc87c3c2ceffe807ca3322f29d
---
M src/osmo-upf/up_session.c
1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/osmo-upf/up_session.c b/src/osmo-upf/up_session.c
index 1438cce..928db0b 100644
--- a/src/osmo-upf/up_session.c
+++ b/src/osmo-upf/up_session.c
@@ -556,8 +556,7 @@
 	return pdr;
 
 nack_resp:
-	if (pdr)
-		pdr_del(pdr);
+	pdr_del(pdr);
 	if (!*offending_ie_present) {
 		*offending_ie = OSMO_PFCP_IEI_UPD_PDR;
 		*offending_ie_present = true;

