fstools: update to git HEAD

 50e6b20 libfstools: handle open() return value properly in F2FS check
 e1b6811 blockd: include missing libubox/utils.h

Signed-off-by: Daniel Golle <[email protected]>

package/system/fstools/Makefile

@@ -12,9 +12,9 @@ PKG_RELEASE:=$(AUTORELEASE)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/fstools.git
-PKG_MIRROR_HASH:=faa4679562ae31cb6dbbc90b7f3f297294a51f7be1b12d10a5f0b7acfaae7252
-PKG_SOURCE_DATE:=2021-08-14
-PKG_SOURCE_VERSION:=2e3aca299ea7bbe74f219860510c4b34e77c7aa4
+PKG_MIRROR_HASH:=c3b711047324b5eb149164b9d82f3ffb155ed579c9b00d7054a35b572201c2b6
+PKG_SOURCE_DATE:=2021-08-25
+PKG_SOURCE_VERSION:=e1b68111e1661c92a773cc5131b55f98d943888f
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPL-2.0