Fix FooterLine.matches(FooterKey) on same length keys

If two keys are the same length, but don't share the same sequence
of characters, we were incorrectly claiming they still matched due
to a bug in the for loop condition.  I used the wrong variable and
the loop never executed, resulting in equality anytime the two keys
being compared were the same length.

Use the proper local variable to loop through the arrays, and add
a JUnit test to verify equality works as expected.

Change-Id: I4a02400e65a9b2e0da925b05a2cc4b579e1dd33a
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/FooterLineTest.java

@@ -306,6 +306,26 @@ public class FooterLineTest extends RepositoryTestCase {
 		assertEquals("Main Tain Er <mte@example.com>", footers.get(1));
 	}
 
+	public void testMatchesBugId() {
+		final RevCommit commit = parse("this is a commit subject for test\n"
+				+ "\n" // paragraph break, now footers appear in final block
+				+ "Simple-Bug-Id: 42\n");
+		final List<FooterLine> footers = commit.getFooterLines();
+
+		assertNotNull(footers);
+		assertEquals(1, footers.size());
+
+		final FooterLine line = footers.get(0);
+		assertNotNull(line);
+		assertEquals("Simple-Bug-Id", line.getKey());
+		assertEquals("42", line.getValue());
+
+		final FooterKey bugid = new FooterKey("Simple-Bug-Id");
+		assertTrue("matches Simple-Bug-Id", line.matches(bugid));
+		assertFalse("not Signed-off-by", line.matches(FooterKey.SIGNED_OFF_BY));
+		assertFalse("not CC", line.matches(FooterKey.CC));
+	}
+
 	private RevCommit parse(final String msg) {
 		final StringBuilder buf = new StringBuilder();
 		buf.append("tree " + ObjectId.zeroId().name() + "\n");

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/FooterLine.java

@@ -90,7 +90,7 @@ public final class FooterLine {
 		int bPtr = keyStart;
 		if (keyEnd - bPtr != len)
 			return false;
-		for (int kPtr = 0; bPtr < len;) {
+		for (int kPtr = 0; kPtr < len;) {
 			byte b = buffer[bPtr++];
 			if ('A' <= b && b <= 'Z')
 				b += 'a' - 'A';