run qemu_cfg_e820 only for CONFIG_QEMU=y

Otherwise we'll clobber the e820 table from coreboot.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c
index b84196a..00e327d 100644
--- a/src/fw/paravirt.c
+++ b/src/fw/paravirt.c
@@ -253,6 +253,9 @@
     struct e820_reservation *table;
     int i, size;
 
+    if (!CONFIG_QEMU)
+        return;
+
     // "etc/e820" has both ram and reservations
     table = romfile_loadfile("etc/e820", &size);
     if (table) {