minor coding style/spelling fixes

Author: goldsimon

doc/savannah.txt

@@ -102,7 +102,7 @@ Archive the current directory using tar, gzip'd, bzip2'd and zip'd.
  tar cjvf lwip-1.4.1.tar.bz2 lwip-1.4.1
  zip -r lwip-1.4.1.zip lwip-1.4.1
 
-Alterntively, archive the current directory using git
+Alternatively, archive the current directory using git
  git archive -o lwip-1.4.1.tar.gz --prefix lwip-1.4.1/ STABLE-1_4_1
 
 Now, sign the archives with a detached GPG binary signature as follows:

src/core/ipv4/icmp.c

@@ -351,7 +351,9 @@ icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
 
   /* Keep IP header + up to 8 bytes */
   response_pkt_len = IP_HLEN + ICMP_DEST_UNREACH_DATASIZE;
-  if (p->tot_len < response_pkt_len) response_pkt_len = p->tot_len;
+  if (p->tot_len < response_pkt_len) {
+    response_pkt_len = p->tot_len;
+  }
 
   /* ICMP header + part of original packet */
   q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_hdr) + response_pkt_len, PBUF_RAM);