winspool.drv: De-constify a variable

[Andrew Talbot]

Changelog:
    winspool.drv: De-constify a variable.

diff --git a/dlls/winspool.drv/info.c b/dlls/winspool.drv/info.c
index 5201e30..f1220da 100644
--- a/dlls/winspool.drv/info.c
+++ b/dlls/winspool.drv/info.c
@@ -514,13 +514,14 @@ static BOOL CUPS_LoadPrinters(void)
 #endif
 
 static BOOL
-PRINTCAP_ParseEntry(const char *pent, BOOL isfirst) {
+PRINTCAP_ParseEntry(char *pent, BOOL isfirst) {
     PRINTER_INFO_2A	pinfo2a;
     char		*e,*s,*name,*prettyname,*devname;
     BOOL		ret = FALSE, set_default = FALSE;
     char *port = NULL, *env_default;
     HKEY hkeyPrinter, hkeyPrinters;
     WCHAR devnameW[MAX_PATH];
+    static CHAR empty[] = "";
 
     while (isspace(*pent)) pent++;
     s = strchr(pent,':');
@@ -531,7 +532,7 @@ PRINTCAP_ParseEntry(const char *pent, BOOL isfirst) {
         *s=':';
         pent = s;
     } else
-        pent = "";
+        pent = empty;
 
     TRACE("name=%s entry=%s\n",name, pent);