Defer this check to the merge analysis

Author: tiennou

ObjectiveGit/GTRepository+Merging.m

@@ -120,11 +120,6 @@ - (BOOL)mergeBranchIntoCurrentBranch:(GTBranch *)branch withError:(NSError **)er
 		return NO;
 	}
 
-	if ([localCommit.SHA isEqualToString:remoteCommit.SHA]) {
-		// Local and remote tracking branch are already in sync
-		return YES;
-	}
-
 	GTMergeAnalysis analysis = GTMergeAnalysisNone;
 	BOOL success = [self analyzeMerge:&analysis fromBranch:branch error:error];
 	if (!success) {