Use pre-increment on iterators

V803 Decreased performance. In case 'userEnd' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. futils.cpp 405
V803 Decreased performance. In case 'authEnd' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. futils.cpp 410
V803 Decreased performance. In case 'hostEnd' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. futils.cpp 428
V803 Decreased performance. In case 'e' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. epsimage.cpp 711
V803 Decreased performance. In case 'e' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. epsimage.cpp 841
V803 Decreased performance. In case 'e' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. epsimage.cpp 958
V803 Decreased performance. In case 'i' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. epsimage.cpp 855
V803 Decreased performance. In case 'it' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. jpgimage.cpp 817
V803 Decreased performance. In case 'lib' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. version.cpp 508
V803 Decreased performance. In case 'it' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. version.cpp 563
V803 Decreased performance. In case 'it' is iterator it's more effective to use prefix form of increment. Replace iterator++ with ++iterator. xmpsidecar.cpp 138

src/futils.cpp

@@ -411,12 +411,12 @@ namespace Exiv2 {
             iterator_t userEnd   = std::find(authStart, authEnd, ':');
             if (userEnd != authEnd) {
                 result.Username = std::string(userStart, userEnd);
-                userEnd++;
+                ++userEnd;
                 result.Password = std::string(userEnd, authEnd);
             } else {
                 result.Username = std::string(authStart, authEnd);
             }
-            authEnd++;
+            ++authEnd;
         } else {
           authEnd = protocolEnd;
         }
@@ -434,7 +434,7 @@ namespace Exiv2 {
         // port
         if ((hostEnd != uriEnd) && ((&*(hostEnd))[0] == ':'))  // we have a port
         {
-            hostEnd++;
+            ++hostEnd;
             iterator_t portEnd = (pathStart != uriEnd) ? pathStart : queryStart;
             result.Port = std::string(hostEnd, portEnd);
         }