Initialize some more pointers for the benefit of MSVC.

There should be no more errors with Visual Studio 2015, in Debug or
Release mode.

arogue7/fight.c

@@ -733,7 +733,7 @@ bool see_att, see_def;
 register char *er, *ee;
 bool back_stab, thrown, short_msg;
 {
-    register char *s;
+    register char *s = "";
     char          att_name[LINELEN],	/* Name of attacker */
 		  def_name[LINELEN]; /* Name of defender */
 
@@ -797,7 +797,7 @@ bool see_att, see_def;
 register char *er, *ee;
 bool thrown, short_msg;
 {
-    register char *s;
+    register char *s = "";
     char
     	          att_name[LINELEN],	/* Name of attacker */
 		  def_name[LINELEN]; /* Name of defender */

arogue7/rip.c

@@ -394,7 +394,7 @@ short monst;
      * Insert player in list if need be
      */
     if (!waswizard) {
-	char *login;
+	char *login = "";
 
 	if (flags != UPDATE) {
             login = md_getusername();

srogue/scrolls.c

@@ -388,7 +388,7 @@ read_scroll()
 		}
 	when S_BAN: {
 		int howdeep;
-		char *ptr;
+		char *ptr = "";
 
 		if (bless) {
 			if (level > 6) {