patch 8.0.0328: the "zero count" error doesn't have a number

Problem:    The "zero count" error doesn't have a number. (Hirohito Higashi)
Solution:   Give it a number and be more specific about the error.

Author: brammool

src/globals.h

@@ -1581,7 +1581,7 @@ EXTERN char_u e_winheight[]	INIT(= N_("E591: 'winheight' cannot be smaller than
 EXTERN char_u e_winwidth[]	INIT(= N_("E592: 'winwidth' cannot be smaller than 'winminwidth'"));
 #endif
 EXTERN char_u e_write[]		INIT(= N_("E80: Error while writing"));
-EXTERN char_u e_zerocount[]	INIT(= N_("Zero count"));
+EXTERN char_u e_zerocount[]	INIT(= N_("E939: Positive count required"));
 #ifdef FEAT_EVAL
 EXTERN char_u e_usingsid[]	INIT(= N_("E81: Using <SID> not in a script context"));
 #endif

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    328,
 /**/
     327,
 /**/