spi_bitbang: txrx_bufs zero status fix

SPI controller drivers return number of bytes actually transfered from bitbang->txrx_bufs() method. Returned zero number of bytes transfered when non-zero number of bytes to transfer was requested should be recognized as error.
The patch fixes that.

---

 spi_bitbang.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

index f7f8580..83c911b 100644
@@ -345,7 +345,9 @@ static void bitbang_work(struct work_struct *work)
 				status = bitbang->txrx_bufs(spi, t);
 			}
 			if (status != t->len) {
-				if (status > 0)
+				/* zero status, meaning zero number of bytes
+				 * transfered, is also invalid in this case */
+				if (status >= 0)
 					status = -EMSGSIZE;
 				break;
 			}

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