Fix build with llvm22

error: incompatible pointer types passing 'char *' to parameter of type 'char **' [-Wincompatible-pointer-types]

Index: Xbr/XbrGfx.c
--- Xbr/XbrGfx.c.orig
+++ Xbr/XbrGfx.c
@@ -351,7 +351,7 @@ unsigned char *XbrGfxParseXBMData(char *data, unsigned
             ptr++;
         }
         token[i] = 0;
-        val = (char) strtol(token, (char *)NULL, 16);
+        val = (char) strtol(token, NULL, 16);
         newdata[j++] = val;
 
         if(*ptr == '}' || *ptr == EOF) done = 1;
