patch 8.1.0052: when mapping to <Nop> times out the next mapping is skipped

Problem:    When a mapping to <Nop> times out the next mapping is skipped.
Solution:   Reset "timedout" when waiting for a character. (Christian
            Brabandt, closes #2921)
diff --git a/src/getchar.c b/src/getchar.c
index ff03905..ce7508c 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -2856,6 +2856,11 @@
 /*
  * get a character: 3. from the user - get it
  */
+		if (typebuf.tb_len == 0)
+		    // timedout may have been set while waiting for a mapping
+		    // that has a <Nop> RHS.
+		    timedout = FALSE;
+
 		wait_tb_len = typebuf.tb_len;
 		c = inchar(typebuf.tb_buf + typebuf.tb_off + typebuf.tb_len,
 			typebuf.tb_buflen - typebuf.tb_off - typebuf.tb_len - 1,
diff --git a/src/version.c b/src/version.c
index 5ff56fd..3187cf2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    52,
+/**/
     51,
 /**/
     50,