Fix for smb4php fseek
Fix for smb4php fseek

The stream_fseek function must return a boolean which will be mapped
to 0 for success and -1 for failure for the caller.

This patch fixes stream_fseek of smb4php to also respect this
convention.

Since the encryption app is relying on fseek to detect whether a file is
encrypted by reading the last bit of data, this will fix #5023

owncloud/core,pmattern/server,pollopolea/core,sharidas/core,nextcloud/server,sharidas/core,cernbox/core,michaelletzgus/nextcloud-server,pixelipo/server,nextcloud/server,pollopolea/core,michaelletzgus/nextcloud-server,pollopolea/core,jbicha/server,owncloud/core,nextcloud/server,pmattern/server,michaelletzgus/nextcloud-server,whitekiba/server,cernbox/core,xx621998xx/server,xx621998xx/server,andreas-p/nextcloud-server,bluelml/core,pmattern/server,nextcloud/server,cernbox/core,IljaN/core,IljaN/core,IljaN/core,whitekiba/server,owncloud/core,endsguy/server,jbicha/server,lrytz/core,pmattern/server,lrytz/core,IljaN/core,sharidas/core,Ardinis/server,michaelletzgus/nextcloud-server,bluelml/core,Ardinis/server,xx621998xx/server,sharidas/core,jbicha/server,owncloud/core,jbicha/server,pmattern/server,whitekiba/server,bluelml/core,pixelipo/server,jbicha/server,lrytz/core,pixelipo/server,endsguy/server,whitekiba/server,pollopolea/core,lrytz/core,phil-davis/core,endsguy/server,xx621998xx/server,pollopolea/core,whitekiba/server,lrytz/core,endsguy/server,andreas-p/nextcloud-server,pixelipo/server,endsguy/server,xx621998xx/server,andreas-p/nextcloud-server,Ardinis/server,bluelml/core,andreas-p/nextcloud-server,IljaN/core,sharidas/core,cernbox/core,Ardinis/server,andreas-p/nextcloud-server,cernbox/core,bluelml/core,pixelipo/server,owncloud/core,Ardinis/server