test-hash: Do not exit check_word_hash() when there is a failure.

This commit makes check_word_hash() run to finish even when there
is a failure during the run.  The test will still fail due to the
output check in AT_CHECK.  And developers can benefit from having
all failed hashes instead of only the first one.

Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

tests/test-hash.c

@@ -100,7 +100,6 @@ check_word_hash(uint32_t (*hash)(uint32_t), const char *name,
                     printf("%s(%08"PRIx32") = %08"PRIx32"\n", name, in2, out2);
                     printf("%d bits of output starting at bit %d "
                            "are both 0x%"PRIx32"\n", min_unique, ofs, bits1);
-                    exit(1);
                 }
             }
         }