u-boot: Update env_resin.h to catch fs fails

Occasionally fs write can fail. It is very rare but has been
observed on the rpi3. Reset uboot if fatwrite fails.

See raspberrypi/linux#2392 and other linked
tickets for more information.

Signed-off-by: Zubair Lutfullah Kakakhel <zubair@balena.io>

meta-balena-common/recipes-bsp/u-boot/patches/env_resin.h

@@ -66,7 +66,7 @@
                      "env set os_bc_inced 1;" \
                      "echo bootcount=${bootcount} now;" \
                      "env export -t ${resin_kernel_load_addr} bootcount;" \
-                     "fatwrite ${resin_dev_type} ${resin_dev_index}:${resin_boot_part} ${resin_kernel_load_addr} ${os_bc_file} 0xd;" \
+                     "if fatwrite ${resin_dev_type} ${resin_dev_index}:${resin_boot_part} ${resin_kernel_load_addr} ${os_bc_file} 0xd; then; else; reset; fi;" \
                      "echo bootcount=${bootcount} written to ${resin_dev_type} ${resin_dev_index}:${resin_boot_part} ${os_bc_file};" \
               "fi;\0" \
        \