blkid: remove no-op statement which caused a clang warning

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/lib/blkid/probe.c b/lib/blkid/probe.c
index 4a929b0..bd31fe0 100644
--- a/lib/blkid/probe.c
+++ b/lib/blkid/probe.c
@@ -43,10 +43,8 @@
 
 	while ((*end == ' ' || *end == 0) && end >= label)
 		--end;
-	if (end >= label) {
-		label = label;
+	if (end >= label)
 		return end - label + 1;
-	}
 	return 0;
 }