Fix segfault bug... wasn't checking the return value of strrchr()

src/xpdev/dirwrap.c

@@ -799,6 +799,8 @@ char * DLLCALL _fullpath(char *target, const char *path, size_t size)  {
 			else if(*(out+1)=='.' && *(out+2)=='.' && (*(out+3)=='/' || *(out+3)==0))  {
 				*out=0;
 				p=strrchr(target,'/');
+				if(p==NULL)
+					p=target;
 				memmove(p,out+3,strlen(out+3)+1);
 				out=p;
 			}