[svn-r17697] Bug fix: (1192)

Error exit code of -1 is illegal (exit code is unsigned).
Changed it to EXIT_FAILURE (1).
Also changed exit(0) to exit(EXIT_SUCCESS) for better coding.

Tested: jam.

tools/h5import/h5import.c

@@ -190,10 +190,10 @@ int main(int argc, char *argv[])
   if (process(&opt) == -1)
     goto err;
 
-  return(0);
+  return(EXIT_SUCCESS);
   err:
     (void) fprintf(stderr, err4);
-    return(-1);
+    return(EXIT_FAILURE);
 }
 
 static int

tools/h5import/h5importtest.c

@@ -370,6 +370,6 @@ main(void)
 
 
 
-    return (0);
+    return (EXIT_SUCCESS);
 }