Compile qemu-error only once

Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

Makefile.objs

@@ -44,7 +44,7 @@ net-obj-y += $(addprefix net/, $(net-nested-y))
 common-obj-y = $(block-obj-y)
 common-obj-y += $(net-obj-y)
 common-obj-y += $(qobject-obj-y)
-common-obj-y += readline.o console.o async.o
+common-obj-y += readline.o console.o async.o qemu-error.o
 
 common-obj-y += tcg-runtime.o host-utils.o
 common-obj-y += irq.o ioport.o input.o

Makefile.target

@@ -162,7 +162,7 @@ endif #CONFIG_BSD_USER
 ifdef CONFIG_SOFTMMU
 
 obj-y = vl.o monitor.o pci.o pci_host.o pcie_host.o machine.o gdbstub.o
-obj-y += qemu-error.o qemu-timer.o
+obj-y += qemu-timer.o
 # virtio has to be here due to weird dependency between PCI and virtio-net.
 # need to fix this properly
 obj-y += virtio-blk.o virtio-balloon.o virtio-net.o virtio-pci.o virtio-serial-bus.o