kvm/eventfd: remove unneeded conversion to bool

The '==' expression itself is bool, no need to convert it to bool again.
This fixes the following coccicheck warning:

virt/kvm/eventfd.c:724:38-43: WARNING: conversion to bool not needed
here
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Message-Id: <20200420123805.4494-1-yanaijie@huawei.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

virt/kvm/eventfd.c

@@ -721,7 +721,7 @@ ioeventfd_in_range(struct _ioeventfd *p, gpa_t addr, int len, const void *val)
 		return false;
 	}
 
-	return _val == p->datamatch ? true : false;
+	return _val == p->datamatch;
 }
 
 /* MMIO/PIO writes trigger an event if the addr/val match */