Fixed handling of $? vs $RC.

check_glsa

@@ -15,7 +15,7 @@ glsa-check -l -n > $GLSA_TMP 2> $ERR_TMP
 RC=$?
 if [ $RC -ne 0 ]
 then
-    echo UNKNOWN - glsa-check returned $?
+    echo UNKNOWN - glsa-check returned $RC
     cat $ERR_TMP
     exit 3
 fi
@@ -43,7 +43,7 @@ case $RC in
        exit 2;;
     1) echo "OK - no GLSA-related problems found. | problems=0, packages=0"
        exit 0;;
-    *) echo UNKNOWN - grep returned $?
+    *) echo UNKNOWN - grep returned $RC
        cat $ERR_TMP
        exit 3;;
 esac