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.

Author: brammool

src/userfunc.c

@@ -875,7 +875,7 @@ get_function_body(
 		--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)

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3171,
 /**/
     3170,
 /**/