kvm tools: Fix 'kvm run' when run the first time

The realpath() function returns NULL if directory does not exists. This patch
changes kvm__set_dir() to call mkdir() to make sure the directory is there.
This fixes 'kvm run' breakage when run the very first time.

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

kvm.c

@@ -90,6 +90,8 @@ static void set_dir(const char *fmt, va_list args)
 
 	vsnprintf(tmp, sizeof(tmp), fmt, args);
 
+	mkdir(tmp, 0777);
+
 	if (!realpath(tmp, kvm_dir))
 		die("Unable to set KVM tool directory");
 }