Use String8/16 c_str [tools]

Bug: 295394788
Test: make checkbuild
Change-Id: I82d6899d8c15a10b15399c39177290012bb5f13b
diff --git a/libs/androidfw/ObbFile.cpp b/libs/androidfw/ObbFile.cpp
index 95332a3..c6a9632 100644
--- a/libs/androidfw/ObbFile.cpp
+++ b/libs/androidfw/ObbFile.cpp
@@ -217,7 +217,7 @@
     free(scanBuf);
 
 #ifdef DEBUG
-    ALOGI("Obb scan succeeded: packageName=%s, version=%d\n", mPackageName.string(), mVersion);
+    ALOGI("Obb scan succeeded: packageName=%s, version=%d\n", mPackageName.c_str(), mVersion);
 #endif
 
     return true;
@@ -288,7 +288,7 @@
         return false;
     }
 
-    if (write(fd, mPackageName.string(), packageNameLen) != (ssize_t)packageNameLen) {
+    if (write(fd, mPackageName.c_str(), packageNameLen) != (ssize_t)packageNameLen) {
         ALOGW("couldn't write package name: %s\n", strerror(errno));
         return false;
     }