KWSys: Fix leaked FILE in EncodeExecutable error case

This leak was detected by cppcheck static analysis.

Author: Hans Johnson <hans-johnson@uiowa.edu>
Change-Id: I1b81cb245acb9a6033f24ecc8d1452ca4df8371a

Source/kwsys/EncodeExecutable.c

@@ -41,6 +41,7 @@ int main(int argc, char* argv[])
   if(!ofp)
     {
     fprintf(stderr, "Cannot open output file: \"%s\"\n", argv[2]);
+    fclose(ifp);
     return 2;
     }