catch exceptions as const

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic2b49715c7b81ac5bcfc12ff2d3b4c593cd95ce7
diff --git a/dbus-sdr/sdrutils.cpp b/dbus-sdr/sdrutils.cpp
index 7788050..ede14bf 100644
--- a/dbus-sdr/sdrutils.cpp
+++ b/dbus-sdr/sdrutils.cpp
@@ -73,7 +73,7 @@
             auto mapperReply = dbus->call(mapperCall);
             mapperReply.read(sensorTreePartial);
         }
-        catch (sdbusplus::exception_t& e)
+        catch (const sdbusplus::exception_t& e)
         {
             phosphor::logging::log<phosphor::logging::level::ERR>(
                 "fail to update subtree",
@@ -264,7 +264,7 @@
     {
         return sensorNumMapPtr->right.at(path);
     }
-    catch (std::out_of_range& e)
+    catch (const std::out_of_range& e)
     {
         phosphor::logging::log<phosphor::logging::level::ERR>(e.what());
         return invalidSensorNumber;
@@ -298,7 +298,7 @@
     {
         return sensorNumMapPtr->left.at(sensorNum);
     }
-    catch (std::out_of_range& e)
+    catch (const std::out_of_range& e)
     {
         phosphor::logging::log<phosphor::logging::level::ERR>(e.what());
         return std::string();
diff --git a/dbus-sdr/sensorcommands.cpp b/dbus-sdr/sensorcommands.cpp
index 7a2cbd0..b07da61 100644
--- a/dbus-sdr/sensorcommands.cpp
+++ b/dbus-sdr/sensorcommands.cpp
@@ -1098,7 +1098,7 @@
     {
         thresholdData = getIPMIThresholds(sensorMap);
     }
-    catch (std::exception&)
+    catch (const std::exception&)
     {
         return ipmi::responseResponseError();
     }
@@ -1628,7 +1628,7 @@
     {
         thresholdData = getIPMIThresholds(sensorMap);
     }
-    catch (std::exception&)
+    catch (const std::exception&)
     {
         phosphor::logging::log<phosphor::logging::level::ERR>(
             "getSensorDataRecord: getIPMIThresholds error");
diff --git a/dbus-sdr/storagecommands.cpp b/dbus-sdr/storagecommands.cpp
index 5926615..0ead858 100644
--- a/dbus-sdr/storagecommands.cpp
+++ b/dbus-sdr/storagecommands.cpp
@@ -141,7 +141,7 @@
     {
         sdbusplus::message::message writeFruResp = dbus->call(writeFru);
     }
-    catch (sdbusplus::exception_t&)
+    catch (const sdbusplus::exception_t&)
     {
         // todo: log sel?
         phosphor::logging::log<phosphor::logging::level::ERR>(
@@ -318,7 +318,7 @@
                                 {
                                     message.read(path, object);
                                 }
-                                catch (sdbusplus::exception_t&)
+                                catch (const sdbusplus::exception_t&)
                                 {
                                     return;
                                 }
@@ -344,7 +344,7 @@
                                 {
                                     message.read(path, interfaces);
                                 }
-                                catch (sdbusplus::exception_t&)
+                                catch (const sdbusplus::exception_t&)
                                 {
                                     return;
                                 }
@@ -843,12 +843,12 @@
             data.push_back(static_cast<uint8_t>(
                 std::stoul(hexStr.substr(i, 2), nullptr, 16)));
         }
-        catch (std::invalid_argument& e)
+        catch (const std::invalid_argument& e)
         {
             phosphor::logging::log<phosphor::logging::level::ERR>(e.what());
             return -1;
         }
-        catch (std::out_of_range& e)
+        catch (const std::out_of_range& e)
         {
             phosphor::logging::log<phosphor::logging::level::ERR>(e.what());
             return -1;
@@ -1158,7 +1158,7 @@
     {
         sdbusplus::message::message reloadResponse = dbus->call(rsyslogReload);
     }
-    catch (sdbusplus::exception_t& e)
+    catch (const sdbusplus::exception_t& e)
     {
         phosphor::logging::log<phosphor::logging::level::ERR>(e.what());
     }