hw/ssi/pnv_spi: Return early in transfer()

Return early to simplify next commit.
No logical change intended.

Cc: [email protected]
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Signed-off-by: Nicholas Piggin <[email protected]>
(cherry picked from commit 3feabc1)
Signed-off-by: Michael Tokarev <[email protected]>

Author: philmd

hw/ssi/pnv_spi.c

@@ -217,6 +217,9 @@ static void transfer(PnvSpi *s, PnvXferBuffer *payload)
     PnvXferBuffer *rsp_payload = NULL;
 
     rsp_payload = pnv_spi_xfer_buffer_new();
+    if (!rsp_payload) {
+        return;
+    }
     for (int offset = 0; offset < payload->len; offset += s->transfer_len) {
         tx = 0;
         for (int i = 0; i < s->transfer_len; i++) {
@@ -235,9 +238,7 @@ static void transfer(PnvSpi *s, PnvXferBuffer *payload)
                     (rx >> (8 * (s->transfer_len - 1) - i * 8)) & 0xFF;
         }
     }
-    if (rsp_payload != NULL) {
-        spi_response(s, s->N1_bits, rsp_payload);
-    }
+    spi_response(s, s->N1_bits, rsp_payload);
 }
 
 static inline uint8_t get_seq_index(PnvSpi *s)