Input: bma150 - fix checking pm_runtime_get_sync() return value

When PM_RUNTIME is not defined, pm_runtime_get_sync() returns 1, see
include/linux/pm_runtime.c::__pm_runtime_resume(), and the check of the
return value was overlooking this, in this case bma150_open() would
return 1 which is not expected by upper layers.

Maybe the check for != -ENOSYS (Function not implemented) was meant to
cover this, but pm_runtime_get_sync() does not return this value.

For now fix the issue locally by checking explicitly for negative return
values.
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Antonio Ospite <ao2@amarulasolutions.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/bma150.c

@@ -372,7 +372,7 @@ static int bma150_open(struct bma150_data *bma150)
 	int error;
 
 	error = pm_runtime_get_sync(&bma150->client->dev);
-	if (error && error != -ENOSYS)
+	if (error < 0 && error != -ENOSYS)
 		return error;
 
 	/*