File return-values.patch of Package grpc

From: Jan Engelhardt <ej@inai.de>
Date: 2025-02-09 21:28:54.517217439 +0100

Fix some terrible code.

[   28s] /home/abuild/rpmbuild/BUILD/grpc-1.70.1-build/grpc-1.70.1/src/core/lib/transport/call_state.h:157:3: error: control reaches end of non-void function [-Werror=return-type]
---
 src/core/lib/transport/call_state.h |    5 +++++
 1 file changed, 5 insertions(+)

Index: grpc-1.70.1/src/core/lib/transport/call_state.h
===================================================================
--- grpc-1.70.1.orig/src/core/call/call_state.h
+++ grpc-1.70.1/src/core/call/call_state.h
@@ -154,6 +154,7 @@ class CallState {
       case ClientToServerPullState::kTerminated:
         return "Terminated";
     }
+    return "Undefined";
   }
   template <typename Sink>
   friend void AbslStringify(Sink& out, ClientToServerPullState state) {
@@ -184,6 +185,7 @@ class CallState {
       case ClientToServerPushState::kFinished:
         return "Finished";
     }
+    return "Undefined";
   }
   template <typename Sink>
   friend void AbslStringify(Sink& out, ClientToServerPushState state) {
@@ -234,6 +236,7 @@ class CallState {
       case ServerToClientPullState::kTerminated:
         return "Terminated";
     }
+    return "Undefined";
   }
   template <typename Sink>
   friend void AbslStringify(Sink& out, ServerToClientPullState state) {
@@ -274,6 +277,7 @@ class CallState {
       case ServerToClientPushState::kFinished:
         return "Finished";
     }
+    return "Undefined";
   }
   template <typename Sink>
   friend void AbslStringify(Sink& out, ServerToClientPushState state) {
@@ -304,6 +308,7 @@ class CallState {
       case ServerTrailingMetadataState::kPulledCancel:
         return "PulledCancel";
     }
+    return "Undefined";
   }
   template <typename Sink>
   friend void AbslStringify(Sink& out, ServerTrailingMetadataState state) {