STM32 F7 Ethernet: Add logic to align all DMA memory to the D-Cache line size

arch/arm/src/stm32f7/stm32_serial.c

@@ -394,9 +394,9 @@ static const struct uart_ops_s g_uart_dma_ops =
 
 /* DMA buffers.  DMA buffers must:
  *
- * 1. Be a multiple of the I-Cache line size.  This requirement is assured
+ * 1. Be a multiple of the D-Cache line size.  This requirement is assured
  *    by the definition of RXDMA buffer size above.
- * 2. Be aligned a I-Cache line boundaries, and 
+ * 2. Be aligned a D-Cache line boundaries, and
  * 3. Be positioned in DMA-able memory (*NOT* DTCM memory).  This must
  *    be managed by logic in the linker script file.
  *

libc/netdb/lib_gethostbynamer.c

@@ -339,7 +339,7 @@ static int lib_dns_query(FAR const char *hostname,
   sd = dns_bind();
   if (sd < 0)
     {
-      return sd; 
+      return sd;
     }
 
   /* Perform the query to get the IP address */