kvm tools: Fix kvm__set_dir() to include trailing slash

All of our code expects kvm__get_dir() to return a path with a trailing slash.
This fixes "kvm run" and "kvm setup" making directories such as
"$HOME/.kvmtoolsdefault" for guest rootfs.

Signed-off-by: Pekka Enberg <penberg@kernel.org>

kvm.c

@@ -94,6 +94,8 @@ static void set_dir(const char *fmt, va_list args)
 
 	if (!realpath(tmp, kvm_dir))
 		die("Unable to set KVM tool directory");
+
+	strcat(kvm_dir, "/");
 }
 
 void kvm__set_dir(const char *fmt, ...)