tegra-minimal-init:platform-preboot.sh: avoid unecessarily boot delay

When foundslotsfx is not set true, it does not have to wait for
APP$slotsfx partition, that can delay the boot.

Signed-off-by: Ming Liu <liu.ming50@gmail.com>

recipes-core/initrdscripts/tegra-minimal-init/platform-preboot.sh

@@ -9,6 +9,7 @@ for bootarg in `cat /proc/cmdline`; do
 	rootwait) wait="yes" ;;
     esac
 done
+
 if [ "$foundslotsfx" != "yes" ]; then
     # This variable file contains a type (should be 6) followed by the value (should be 0 or 1)
     bcdata=$(echo $(hexdump -n 8 -e '2/4 " %u"' /sys/firmware/efi/efivars/BootChainOsCurrent-781e084c-a330-417c-b678-38e696380cb9 2>/dev/null))
@@ -16,20 +17,21 @@ if [ "$foundslotsfx" != "yes" ]; then
 	slotnum=$(echo "$bcdata" | cut -d' ' -f2)
 	[ "$slotnum" != "1" ] || slotsfx="_b"
     fi
+
+    message="Waiting for APP$slotsfx partition..."
+    for count in $(seq 1 10); do
+        blkid --probe 2>/dev/null
+        rootdev=`blkid -l -t PARTLABEL=APP$slotsfx | cut -d: -f1`
+        if [ -n "$rootdev" ]; then
+            echo "[OK: $rootdev]"
+            break
+        fi
+        echo -n "$message"
+        message="."
+        sleep 0.5
+    done
 fi
 
-message="Waiting for APP$slotsfx partition..."
-for count in $(seq 1 10); do
-    blkid --probe 2>/dev/null
-    rootdev=`blkid -l -t PARTLABEL=APP$slotsfx | cut -d: -f1`
-    if [ -n "$rootdev" ]; then
-	echo "[OK: $rootdev]"
-	break
-    fi
-    echo -n "$message"
-    message="."
-    sleep 0.5
-done
 if [ -z "$rootdev" ]; then
     echo "[FAIL]"
     if [ -n "$mayberoot" ]; then