Make sure these are initialized to NULL

ext/sybase/php_sybase_db.c

@@ -257,14 +257,13 @@ PHP_RSHUTDOWN_FUNCTION(sybase)
 
 static void php_sybase_do_connect(INTERNAL_FUNCTION_PARAMETERS,int persistent)
 {
-	char *user,*passwd,*host,*charset;
+	char *user=NULL,*passwd=NULL,*host=NULL,*charset=NULL;
 	char *hashed_details;
 	int hashed_details_length;
 	sybase_link sybase,*sybase_ptr;
 
 	switch(ZEND_NUM_ARGS()) {
 		case 0: /* defaults */
-			host=user=passwd=NULL;
 			hashed_details_length=6+3;
 			hashed_details = (char *) emalloc(hashed_details_length+1);
 			strcpy(hashed_details,"sybase___");
@@ -277,7 +276,6 @@ static void php_sybase_do_connect(INTERNAL_FUNCTION_PARAMETERS,int persistent)
 				}
 				convert_to_string(yyhost);
 				host = yyhost->value.str.val;
-				user=passwd=charset=NULL;
 				hashed_details_length = yyhost->value.str.len+6+3;
 				hashed_details = (char *) emalloc(hashed_details_length+1);
 				sprintf(hashed_details,"sybase_%s__",yyhost->value.str.val);
@@ -293,7 +291,6 @@ static void php_sybase_do_connect(INTERNAL_FUNCTION_PARAMETERS,int persistent)
 				convert_to_string(yyuser);
 				host = yyhost->value.str.val;
 				user = yyuser->value.str.val;
-				passwd=charset=NULL;
 				hashed_details_length = yyhost->value.str.len+yyuser->value.str.len+6+3;
 				hashed_details = (char *) emalloc(hashed_details_length+1);
 				sprintf(hashed_details,"sybase_%s_%s_",yyhost->value.str.val,yyuser->value.str.val);
@@ -311,7 +308,6 @@ static void php_sybase_do_connect(INTERNAL_FUNCTION_PARAMETERS,int persistent)
 				host = yyhost->value.str.val;
 				user = yyuser->value.str.val;
 				passwd = yypasswd->value.str.val;
-				charset = NULL;
 				hashed_details_length = yyhost->value.str.len+yyuser->value.str.len+yypasswd->value.str.len+6+3;
 				hashed_details = (char *) emalloc(hashed_details_length+1);
 				sprintf(hashed_details,"sybase_%s_%s_%s",yyhost->value.str.val,yyuser->value.str.val,yypasswd->value.str.val); /* SAFE */