performCallback: Don't return errors

Just because a callback throws an error doesn't mean that we want it to
stop source processing.

Change-Id: Ifcd5f61b3423033f720b1e683b56aa49570e6581
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/sdeventplus/internal/utils.hpp b/src/sdeventplus/internal/utils.hpp
index 9d612e5..c078ed6 100644
--- a/src/sdeventplus/internal/utils.hpp
+++ b/src/sdeventplus/internal/utils.hpp
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <cerrno>
 #include <chrono>
 #include <cstdio>
 #include <exception>
@@ -30,23 +29,16 @@
     try
     {
         std::invoke(std::forward<Args>(args)...);
-        return 0;
-    }
-    catch (const std::system_error& e)
-    {
-        fprintf(stderr, "sdeventplus: %s: %s\n", name, e.what());
-        return -e.code().value();
     }
     catch (const std::exception& e)
     {
         fprintf(stderr, "sdeventplus: %s: %s\n", name, e.what());
-        return -ENOSYS;
     }
     catch (...)
     {
         fprintf(stderr, "sdeventplus: %s: Unknown error\n", name);
-        return -ENOSYS;
     }
+    return 0;
 }
 
 /** @brief Constructs an SdEventError for stdplus cexec
diff --git a/test/internal/utils.cpp b/test/internal/utils.cpp
index 8f5d75c..3836c57 100644
--- a/test/internal/utils.cpp
+++ b/test/internal/utils.cpp
@@ -34,21 +34,21 @@
 
 TEST(UtilsTest, SetPrepareSystemError)
 {
-    EXPECT_EQ(-EBUSY, performCallback("system_error", []() {
-        throw std::system_error(EBUSY, std::generic_category());
-    }));
+    EXPECT_EQ(0, performCallback("system_error", []() {
+                  throw std::system_error(EBUSY, std::generic_category());
+              }));
 }
 
 TEST(UtilsTest, SetPrepareException)
 {
-    EXPECT_EQ(-ENOSYS, performCallback("runtime_error", []() {
-        throw std::runtime_error("Exception");
-    }));
+    EXPECT_EQ(0, performCallback("runtime_error", []() {
+                  throw std::runtime_error("Exception");
+              }));
 }
 
 TEST(UtilsTest, SetPrepareUnknownException)
 {
-    EXPECT_EQ(-ENOSYS,
+    EXPECT_EQ(0,
               performCallback("unknown", []() { throw static_cast<int>(1); }));
 }