qemu: Wrap controllers code into dummy loop

which just re-indent code and prepare it for next patch.

src/qemu/qemu_command.c

@@ -4429,7 +4429,7 @@ qemuBuildCommandLine(virConnectPtr conn,
                      virDomainSnapshotObjPtr snapshot,
                      enum virNetDevVPortProfileOp vmop)
 {
-    int i;
+    int i, j;
     struct utsname ut;
     int disableKQEMU = 0;
     int enableKQEMU = 0;
@@ -5024,7 +5024,8 @@ qemuBuildCommandLine(virConnectPtr conn,
     }
 
     if (qemuCapsGet(caps, QEMU_CAPS_DEVICE)) {
-        for (i = 0 ; i < def->ncontrollers ; i++) {
+        for (j = 0; j < 1; j++) {
+            for (i = 0; i < def->ncontrollers; i++) {
                 virDomainControllerDefPtr cont = def->controllers[i];
 
                 /* We don't add an explicit IDE or FD controller because the
@@ -5082,6 +5083,7 @@ qemuBuildCommandLine(virConnectPtr conn,
                 }
             }
         }
+    }
 
     if (usbcontroller == 0)
         virCommandAddArg(cmd, "-usb");
@@ -5553,7 +5555,6 @@ qemuBuildCommandLine(virConnectPtr conn,
         virDomainSmartcardDefPtr smartcard = def->smartcards[0];
         char *devstr;
         virBuffer opt = VIR_BUFFER_INITIALIZER;
-        int j;
         const char *database;
 
         if (def->nsmartcards > 1 ||