patch 8.2.3171: another illegal memory access in test

Problem:    Another illegal memory access in test.
Solution:   Check pointer is after the start of the line.
diff --git a/src/userfunc.c b/src/userfunc.c
index d8c943b..3dfa680 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -875,7 +875,7 @@
 		--end;
 		while (end > p && VIM_ISWHITE(*end))
 		    --end;
-		if (end > p - 2 && end[-1] == '=' && end[0] == '>')
+		if (end > p + 2 && end[-1] == '=' && end[0] == '>')
 		{
 		    // found trailing "=> {", start of an inline function
 		    if (nesting == MAX_FUNC_NESTING - 1)
diff --git a/src/version.c b/src/version.c
index 5b3a97b..3caf18d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3171,
+/**/
     3170,
 /**/
     3169,