Fix Sparse warning

Fix this warning:
./qemu-options.h:198:1: error: expected preprocessor identifier

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/qemu-options.hx b/qemu-options.hx
index 87af798..fa549c3 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -723,7 +723,7 @@
 @table @option
 ETEXI
 
-DEF("net", HAS_ARG, QEMU_OPTION_net, \
+DEF("net", HAS_ARG, QEMU_OPTION_net,
     "-net nic[,vlan=n][,macaddr=addr][,model=type][,name=str]\n"
     "                create a new Network Interface Card and connect it to VLAN 'n'\n"
 #ifdef CONFIG_SLIRP