NAME Casting retval should work
PROG ur:./testprogs/uprobe_negative_retval:main   /(int32)retval < 0/ { @[(int32)retval]=count(); exit();}
AFTER ./testprogs/uprobe_negative_retval
EXPECT @[-100]: 1

NAME Sum casted retval
PROG ur:./testprogs/uprobe_negative_retval:function1 { @=stats((int32)retval); exit();} ur:./testprogs/uprobe_negative_retval:main { exit() }
AFTER ./testprogs/uprobe_negative_retval
EXPECT @: { .count = 221, .average = -10, .total = -2210 }
