Fix a warning in CSDiag.
Fix a warning in CSDiag.

The function return value is bool but we were returning a nullptr.

MukeshKumarS/Swift,xwu/swift,gregomni/swift,jckarter/swift,hooman/swift,ken0nek/swift,tjw/swift,bitjammer/swift,Ivacker/swift,alblue/swift,tkremenek/swift,mightydeveloper/swift,emilstahl/swift,huonw/swift,kstaring/swift,airspeedswift/swift,zisko/swift,lorentey/swift,nathawes/swift,lorentey/swift,sdulal/swift,tardieu/swift,LeoShimonaka/swift,xedin/swift,modocache/swift,karwa/swift,deyton/swift,tjw/swift,IngmarStein/swift,allevato/swift,benlangmuir/swift,frootloops/swift,amraboelela/swift,xedin/swift,amraboelela/swift,ken0nek/swift,stephentyrone/swift,benlangmuir/swift,roambotics/swift,adrfer/swift,practicalswift/swift,devincoughlin/swift,glessard/swift,Ivacker/swift,huonw/swift,benlangmuir/swift,dduan/swift,ken0nek/swift,lorentey/swift,codestergit/swift,atrick/swift,adrfer/swift,ben-ng/swift,xwu/swift,uasys/swift,alblue/swift,xedin/swift,natecook1000/swift,ben-ng/swift,brentdax/swift,apple/swift,brentdax/swift,OscarSwanros/swift,adrfer/swift,sdulal/swift,jopamer/swift,ben-ng/swift,swiftix/swift,danielmartin/swift,atrick/swift,practicalswift/swift,JGiola/swift,slavapestov/swift,tardieu/swift,khizkhiz/swift,roambotics/swift,danielmartin/swift,harlanhaskins/swift,gottesmm/swift,danielmartin/swift,devincoughlin/swift,shahmishal/swift,arvedviehweger/swift,return/swift,SwiftAndroid/swift,therealbnut/swift,sschiau/swift,felix91gr/swift,khizkhiz/swift,IngmarStein/swift,kusl/swift,austinzheng/swift,dduan/swift,alblue/swift,kentya6/swift,sschiau/swift,tkremenek/swift,allevato/swift,adrfer/swift,LeoShimonaka/swift,alblue/swift,therealbnut/swift,MukeshKumarS/Swift,manavgabhawala/swift,hooman/swift,swiftix/swift,IngmarStein/swift,KrishMunot/swift,tjw/swift,airspeedswift/swift,hooman/swift,modocache/swift,modocache/swift,zisko/swift,glessard/swift,milseman/swift,glessard/swift,MukeshKumarS/Swift,kstaring/swift,kentya6/swift,airspeedswift/swift,djwbrown/swift,apple/swift,glessard/swift,sschiau/swift,harlanhaskins/swift,johnno1962d/swift,khizkhiz/swift,huonw/swift,calebd/swift,dduan/swift,sdulal/swift,frootloops/swift,CodaFi/swift,practicalswift/swift,hughbe/swift,swiftix/swift,devincoughlin/swift,airspeedswift/swift,djwbrown/swift,xedin/swift,SwiftAndroid/swift,danielmartin/swift,airspeedswift/swift,gmilos/swift,return/swift,IngmarStein/swift,manavgabhawala/swift,alblue/swift,austinzheng/swift,shajrawi/swift,Jnosh/swift,jmgc/swift,IngmarStein/swift,gribozavr/swift,sdulal/swift,kperryua/swift,milseman/swift,jtbandes/swift,karwa/swift,stephentyrone/swift,deyton/swift,swiftix/swift.old,gribozavr/swift,Ivacker/swift,gottesmm/swift,hughbe/swift,kstaring/swift,russbishop/swift,sschiau/swift,CodaFi/swift,gregomni/swift,adrfer/swift,slavapestov/swift,OscarSwanros/swift,amraboelela/swift,lorentey/swift,stephentyrone/swift,shahmishal/swift,huonw/swift,practicalswift/swift,atrick/swift,emilstahl/swift,mightydeveloper/swift,Jnosh/swift,amraboelela/swift,arvedviehweger/swift,modocache/swift,dreamsxin/swift,felix91gr/swift,kentya6/swift,apple/swift,KrishMunot/swift,ahoppen/swift,mightydeveloper/swift,milseman/swift,xedin/swift,huonw/swift,rudkx/swift,therealbnut/swift,gribozavr/swift,JGiola/swift,jopamer/swift,calebd/swift,russbishop/swift,brentdax/swift,gregomni/swift,kentya6/swift,kperryua/swift,modocache/swift,swiftix/swift.old,nathawes/swift,kusl/swift,natecook1000/swift,huonw/swift,tkremenek/swift,cbrentharris/swift,practicalswift/swift,jmgc/swift,slavapestov/swift,gmilos/swift,felix91gr/swift,lorentey/swift,aschwaighofer/swift,zisko/swift,lorentey/swift,tkremenek/swift,xwu/swift,tinysun212/swift-windows,stephentyrone/swift,arvedviehweger/swift,sschiau/swift,KrishMunot/swift,russbishop/swift,karwa/swift,cbrentharris/swift,swiftix/swift,cbrentharris/swift,gmilos/swift,deyton/swift,SwiftAndroid/swift,CodaFi/swift,gottesmm/swift,shajrawi/swift,benlangmuir/swift,CodaFi/swift,kusl/swift,aschwaighofer/swift,devincoughlin/swift,johnno1962d/swift,harlanhaskins/swift,jmgc/swift,Ivacker/swift,johnno1962d/swift,shahmishal/swift,parkera/swift,airspeedswift/swift,hooman/swift,kusl/swift,dduan/swift,shahmishal/swift,JGiola/swift,gregomni/swift,ben-ng/swift,aschwaighofer/swift,parkera/swift,apple/swift,jckarter/swift,LeoShimonaka/swift,SwiftAndroid/swift,ken0nek/swift,modocache/swift,bitjammer/swift,jckarter/swift,emilstahl/swift,alblue/swift,amraboelela/swift,JaSpa/swift,lorentey/swift,parkera/swift,stephentyrone/swift,karwa/swift,austinzheng/swift,kperryua/swift,therealbnut/swift,roambotics/swift,stephentyrone/swift,frootloops/swift,rudkx/swift,ben-ng/swift,kentya6/swift,johnno1962d/swift,emilstahl/swift,kentya6/swift,kstaring/swift,hooman/swift,tardieu/swift,rudkx/swift,jckarter/swift,danielmartin/swift,danielmartin/swift,parkera/swift,gottesmm/swift,calebd/swift,natecook1000/swift,swiftix/swift,deyton/swift,harlanhaskins/swift,jtbandes/swift,milseman/swift,felix91gr/swift,arvedviehweger/swift,swiftix/swift.old,huonw/swift,kperryua/swift,manavgabhawala/swift,frootloops/swift,uasys/swift,jtbandes/swift,mightydeveloper/swift,natecook1000/swift,t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