mksquashfsimage.sh: Add forward slash for SRC_DIR

There is a bug in mksquashfs that fails to interpret symlink dirs unless
they have a forward slash

Change-Id: I64df07d99858a792e1d7af5d11234fe8b75f91ae
Signed-off-by: Mohamad Ayyash <mkayyash@google.com>
diff --git a/squashfs_utils/mksquashfsimage.sh b/squashfs_utils/mksquashfsimage.sh
index 7f96cb1..dbf7166 100755
--- a/squashfs_utils/mksquashfsimage.sh
+++ b/squashfs_utils/mksquashfsimage.sh
@@ -53,7 +53,7 @@
   OPT="$OPT -b $BLOCK_SIZE"
 fi
 
-MAKE_SQUASHFS_CMD="mksquashfs $SRC_DIR $OUTPUT_FILE -no-progress -comp lz4 -Xhc -no-exports -noappend -no-recovery -android-fs-config $OPT"
+MAKE_SQUASHFS_CMD="mksquashfs $SRC_DIR/ $OUTPUT_FILE -no-progress -comp lz4 -Xhc -no-exports -noappend -no-recovery -android-fs-config $OPT"
 echo $MAKE_SQUASHFS_CMD
 $MAKE_SQUASHFS_CMD
 if [ $? -ne 0 ]; then