Remove extra line in warnings in ivfdec.c

The warnings give an extra line which is confusing sometimes.

E.g.

Warning: Read invalid frame size (308164564) // This is for frame 5

Warning: Failed to decode frame 5: Invalid parameter
Warning: Read invalid frame size (1936229463) // This is for frame 6

Warning: Failed to decode frame 6: Invalid parameter
Warning: Read invalid frame size (2282536257)

Change-Id: I1753fa32079deca5c8b534c6ca9a527cc9e491e9

ivfdec.c

@@ -76,12 +76,12 @@ int ivf_read_frame(FILE *infile, uint8_t **buffer, size_t *bytes_read,
   size_t frame_size = 0;
 
   if (fread(raw_header, IVF_FRAME_HDR_SZ, 1, infile) != 1) {
-    if (!feof(infile)) warn("Failed to read frame size\n");
+    if (!feof(infile)) warn("Failed to read frame size");
   } else {
     frame_size = mem_get_le32(raw_header);
 
     if (frame_size > 256 * 1024 * 1024) {
-      warn("Read invalid frame size (%u)\n", (unsigned int)frame_size);
+      warn("Read invalid frame size (%u)", (unsigned int)frame_size);
       frame_size = 0;
     }
 
@@ -92,15 +92,15 @@ int ivf_read_frame(FILE *infile, uint8_t **buffer, size_t *bytes_read,
         *buffer = new_buffer;
         *buffer_size = 2 * frame_size;
       } else {
-        warn("Failed to allocate compressed data buffer\n");
+        warn("Failed to allocate compressed data buffer");
         frame_size = 0;
       }
     }
   }
 
   if (!feof(infile)) {
     if (fread(*buffer, 1, frame_size, infile) != frame_size) {
-      warn("Failed to read full frame\n");
+      warn("Failed to read full frame");
       return 1;
     }