Topology::remove: simplify loop

Do not remove the empty vector if there are no more elements.

There is a small amount of port types so removing that map entry would
not make a significant difference.

Not removing it however simplifies the code.

Tested: Topology Unit Tests Pass

Change-Id: Ica8e09ee9a056adf3f50d1c1afd243898ead0acf
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/src/entity_manager/topology.cpp b/src/entity_manager/topology.cpp
index 90d8c8d..5ae4d94 100644
--- a/src/entity_manager/topology.cpp
+++ b/src/entity_manager/topology.cpp
@@ -99,41 +99,23 @@
 
     boardNames.erase(boardFind);
 
-    for (auto it = upstreamPorts.begin(); it != upstreamPorts.end();)
+    for (auto& upstreamPort : upstreamPorts)
     {
-        auto pathIt =
-            std::find(it->second.begin(), it->second.end(), boardPath);
-        if (pathIt != it->second.end())
+        auto pathIt = std::find(upstreamPort.second.begin(),
+                                upstreamPort.second.end(), boardPath);
+        if (pathIt != upstreamPort.second.end())
         {
-            it->second.erase(pathIt);
-        }
-
-        if (it->second.empty())
-        {
-            it = upstreamPorts.erase(it);
-        }
-        else
-        {
-            ++it;
+            upstreamPort.second.erase(pathIt);
         }
     }
 
-    for (auto it = downstreamPorts.begin(); it != downstreamPorts.end();)
+    for (auto& downstreamPort : downstreamPorts)
     {
-        auto pathIt =
-            std::find(it->second.begin(), it->second.end(), boardPath);
-        if (pathIt != it->second.end())
+        auto pathIt = std::find(downstreamPort.second.begin(),
+                                downstreamPort.second.end(), boardPath);
+        if (pathIt != downstreamPort.second.end())
         {
-            it->second.erase(pathIt);
-        }
-
-        if (it->second.empty())
-        {
-            it = downstreamPorts.erase(it);
-        }
-        else
-        {
-            ++it;
+            downstreamPort.second.erase(pathIt);
         }
     }
 }