Use better formatting string for printing numbers
Use better formatting string for printing numbers

Numbers were printed as hexadecimal.n eror message,
It is good practice to print "0x" before hexadecimal numbers,
because it may be confusing without this.

Reviewed-by: Andreas Schneider <5be00ddc76278cf6077f5047ca3384a88460c671@cryptomilk.org>

wingyplus/cmocka,dsch/cmocka,jhrozek/cmocka,jschmidlapp/cmocka,JonathonReinhart/cmocka,clibs/cmocka,Odie/cmocka,VladimirTyrin/cmocka,jamesmunns/CMocka,tyc/cmocka,nuumio/cmocka,lsjostro/cmocka,jhrozek/cmocka,Odie/cmocka,Odie/cmocka,jschmidlapp/cmocka,jschmidlapp/cmocka,jhrozek/cmocka,VladimirTyrin/cmocka,lsjostro/cmocka,dsch/cmocka,jamesmunns/CMocka,tyc/cmocka,nuumio/cmocka,nuumio/cmocka,wingyplus/cmocka,JonathonReinhart/cmocka,tyc/cmocka,clibs/cmocka