patch 8.2.5122: lisp indenting my run over the end of the line

Problem:    Lisp indenting my run over the end of the line.
Solution:   Check for NUL earlier.

src/indent.c

@@ -2029,6 +2029,8 @@ get_lisp_indent(void)
 			    }
 			}
 		    }
+		    if (*that == NUL)
+			break;
 		}
 		if (*that == '(' || *that == '[')
 		    ++parencount;

src/testdir/test_indent.vim

@@ -144,6 +144,16 @@ func Test_lisp_indent()
   close!
 endfunc
 
+func Test_lisp_indent_quoted()
+  " This was going past the end of the line
+  new
+  setlocal lisp autoindent
+  call setline(1, ['"[', '='])
+  normal Gvk=
+
+  bwipe!
+endfunc
+
 " Test for setting the 'indentexpr' from a modeline
 func Test_modeline_indent_expr()
   let modeline = &modeline

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    5122,
 /**/
     5121,
 /**/