Fix typo in valid_star.

(Imported from upstream's 9a3bf97315aa121441777bf1bc4bea3c5e00af29.)

Change-Id: I1ce28437333012347985c788c86671f5ec34b34f
Reviewed-on: https://boringssl-review.googlesource.com/4888
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/x509v3/v3_utl.c b/crypto/x509v3/v3_utl.c
index d79f0de..40f4ade 100644
--- a/crypto/x509v3/v3_utl.c
+++ b/crypto/x509v3/v3_utl.c
@@ -751,7 +751,7 @@
 		if (p[i] == '*')
 			{
 			int atstart = (state & LABEL_START);
-			int atend = (i == len - 1 || p[i+i] == '.');
+			int atend = (i == len - 1 || p[i+1] == '.');
 			/*
 			 * At most one wildcard per pattern.
 			 * No wildcards in IDNA labels.