openflow: don't overwrite CVE_CHECK_IGNORE

The recipe contains two CVE_CHECK_IGNORE declarations, and the second
one overwrites the first one - however the first one is also important.

Instead of overwriting it, just append them to each other. Also, move the
operations closer to each other, so it's easier to see what's going on.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

meta-networking/recipes-protocols/openflow/openflow.inc

@@ -18,6 +18,10 @@ CVE_CHECK_IGNORE = "\
     CVE-2015-1612 \
 "
 
+# This CVE is not for this product but cve-check assumes it is
+# because two CPE collides when checking the NVD database
+CVE_CHECK_IGNORE += "CVE-2018-1078"
+
 DEPENDS = "virtual/libc"
 
 PACKAGECONFIG ??= ""
@@ -58,7 +62,3 @@ do_install:append() {
 }
 
 FILES:${PN} += "${nonarch_libdir}/tmpfiles.d"
-
-# This CVE is not for this product but cve-check assumes it is
-# because two CPE collides when checking the NVD database
-CVE_CHECK_IGNORE = "CVE-2018-1078"