omap3: overo: Fix fdtfile test

Commit 12cc54376768461533b55ada1b0b6d4979f40579 'omap3: overo: Select
fdtfile for expansion board' wrongly missed the operator in the fdtfile
test. Update the test to only overwrite an empty fdtfile environment
variable.

Signed-off-by: Stefan Herbrechtsmeier <stefan@herbrechtsmeier.net>

diff --git a/include/configs/omap3_overo.h b/include/configs/omap3_overo.h
index e66f30655d67d864a79bcf1f1f21fdffc8c637da..b17e495f5f7915af44e75c8841932299a810e2a2 100644 (file)
--- a/include/configs/omap3_overo.h
+++ b/include/configs/omap3_overo.h
@@ -151,7 +151,7 @@
                        "run mmcboot;" \
                "fi;" \
                "if run loadzimage; then " \
-                       "if test $fdtfile; then " \
+                       "if test -z \"${fdtfile}\"; then " \
                                "setenv fdtfile omap3-${boardname}-${expansionname}.dtb;" \
                        "fi;" \
                        "if run loadfdt; then " \