ci: Read test output from stderr

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

ci/runtest-android.rs

@@ -22,7 +22,7 @@ fn main() {
         .arg(&test)
         .arg(&dst)
         .status()
-        .expect("failed to run: adb pushr");
+        .expect("failed to run: adb push");
     assert!(status.success());
 
     let output = Command::new("adb")
@@ -38,8 +38,8 @@ fn main() {
              String::from_utf8_lossy(&output.stdout),
              String::from_utf8_lossy(&output.stderr));
 
-    let stdout = String::from_utf8_lossy(&output.stdout);
-    stdout.lines().find(|l|
+    let stderr = String::from_utf8_lossy(&output.stderr);
+    stderr.lines().find(|l|
         (l.starts_with("PASSED ") && l.contains(" tests")) ||
         l.starts_with("test result: ok")
     ).unwrap_or_else(|| {