reduce error to warning - happens for valid progs-section-less programs am: 21f34cb32c am: c2fe18428e am: c44910988a

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1387317

Change-Id: I90fe97de22008bfd80d121fe2d9c46e8591b4fa2
diff --git a/libbpf_android/Loader.cpp b/libbpf_android/Loader.cpp
index da6a109..47e6c67 100644
--- a/libbpf_android/Loader.cpp
+++ b/libbpf_android/Loader.cpp
@@ -313,7 +313,7 @@
 
     /* No section found with matching name*/
     if (sec_idx == -1) {
-        ALOGE("No %s section could be found in elf object\n", sectionName.c_str());
+        ALOGW("No %s section could be found in elf object\n", sectionName.c_str());
         return -1;
     }