[trunk] Remove mem leak and warning reported by clang

src/bin/jp2/opj_compress.c

@@ -408,9 +408,7 @@ static int get_file_format(char *filename) {
 }
 
 static char * get_file_name(char *name){
-    char *fname;
-    fname= (char*)malloc(OPJ_PATH_LEN*sizeof(char));
-    fname= strtok(name,".");
+    char *fname = strtok(name,".");
     return fname;
 }