patch 9.0.0878: Coverity warns for dead code

Problem:    Coverity warns for dead code.
Solution:   Remove the dead code.
diff --git a/src/cmdhist.c b/src/cmdhist.c
index c46a3a6..ea95547 100644
--- a/src/cmdhist.c
+++ b/src/cmdhist.c
@@ -137,7 +137,7 @@
     // history length changed
     for (type = 0; type < HIST_COUNT; ++type)   // adjust the tables
     {
-	if (newlen)
+	if (newlen > 0)
 	{
 	    temp = ALLOC_MULT(histentry_T, newlen);
 	    if (temp == NULL)   // out of memory!
@@ -157,9 +157,6 @@
 	else
 	    temp = NULL;
 
-	if (newlen != 0 && temp == NULL)
-	    continue;
-
 	if (hisidx[type] < 0)		// there are no entries yet
 	{
 	    for (i = 0; i < newlen; ++i)