Replace CHECK(x && y) with two separate CHECK() calls

That way, the debug printout will tell us which of x and y that was false.

BUG=none

Review-Url: https://codereview.webrtc.org/2988153003
Cr-Commit-Position: refs/heads/master@{#19297}
diff --git a/webrtc/rtc_base/opensslstreamadapter.cc b/webrtc/rtc_base/opensslstreamadapter.cc
index 1c0b578..53f35fc 100644
--- a/webrtc/rtc_base/opensslstreamadapter.cc
+++ b/webrtc/rtc_base/opensslstreamadapter.cc
@@ -555,7 +555,8 @@
   switch (ssl_error) {
   case SSL_ERROR_NONE:
     LOG(LS_VERBOSE) << " -- success";
-    RTC_DCHECK(0 < code && static_cast<unsigned>(code) <= data_len);
+    RTC_DCHECK_GT(code, 0);
+    RTC_DCHECK_LE(code, data_len);
     if (written)
       *written = code;
     return SR_SUCCESS;
@@ -619,7 +620,8 @@
   switch (ssl_error) {
     case SSL_ERROR_NONE:
       LOG(LS_VERBOSE) << " -- success";
-      RTC_DCHECK(0 < code && static_cast<unsigned>(code) <= data_len);
+      RTC_DCHECK_GT(code, 0);
+      RTC_DCHECK_LE(code, data_len);
       if (read)
         *read = code;