tls: fix (improbable) out of bounds read

Although read(fd, out-of-bounds-address, 0) should not
actually result in a crash, this keeps static analysis
tools happy.

Refs #51340

Change-Id: Ie22ed8837f37dd1ba2b55749458815f91dfdc34a

daemon/src/sip/tlsvalidation.c

@@ -102,7 +102,7 @@ static unsigned char *crypto_file_read(const char *path, size_t *out_len)
             goto out;
         }
         *out_len += bytes_read;
-    } while ((bytes_read > 0) && (*out_len <= file_size));
+    } while ((bytes_read > 0) && (*out_len < file_size));
 
 out:
     close(fd);