[openwrt/openwrt] mediatek: fix bashism in gen_banana_pi_img.sh

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/f632747704f172e5c6d3a7c5715dc8d2f50d8da8

commit f632747704f172e5c6d3a7c5715dc8d2f50d8da8
Author: David Woodhouse <dwmw2 at infradead.org>
AuthorDate: Thu Jul 9 09:56:18 2020 +0100

    mediatek: fix bashism in gen_banana_pi_img.sh
    
    There was a bashism in the script. This fixes the script so that it
    doesn't actually require bash, and can be run with any POSIX shell as
    its shebang suggests.
    
    Signed-off-by: David Woodhouse <dwmw2 at infradead.org>
---
 target/linux/mediatek/image/gen_banana_pi_img.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/mediatek/image/gen_banana_pi_img.sh b/target/linux/mediatek/image/gen_banana_pi_img.sh
index 26fbca1388..d46e92fa42 100755
--- a/target/linux/mediatek/image/gen_banana_pi_img.sh
+++ b/target/linux/mediatek/image/gen_banana_pi_img.sh
@@ -78,7 +78,7 @@
 # The contents of the main eMMC are identical to the SD card layout,
 # with the preloader loading 512KiB of U-Boot starting at 0x50000.
 
-function usage() {
+usage() {
     echo "SYNTAX: $0 sd <file> <preloader image> <u-boot image> <bootfs image> <rootfs image> <bootfs size> <rootfs size>"
     echo " OR:    $0 emmc <file> <preloader image>"
     exit 1