aacdec_usac: rename noise_scale to noise_bands

This was a typo.

libavcodec/aac/aacdec.h

@@ -315,7 +315,7 @@ typedef struct AACUsacElemConfig {
 
             uint8_t freq_scale; /* dflt_freq_scale */
             uint8_t alter_scale : 1; /* dflt_alter_scale */
-            uint8_t noise_scale; /* dflt_noise_scale */
+            uint8_t noise_bands; /* dflt_noise_bands */
 
             uint8_t limiter_bands; /* dflt_limiter_bands */
             uint8_t limiter_gains; /* dflt_limiter_gains */

libavcodec/aac/aacdec_usac.c

@@ -162,11 +162,11 @@ static void decode_usac_sbr_data(AACUsacElemConfig *e, GetBitContext *gb)
 
     e->sbr.dflt.freq_scale = 2;
     e->sbr.dflt.alter_scale = 1;
-    e->sbr.dflt.noise_scale = 2;
+    e->sbr.dflt.noise_bands = 2;
     if (header_extra1) {
         e->sbr.dflt.freq_scale = get_bits(gb, 2); /* dflt_freq_scale */
         e->sbr.dflt.alter_scale = get_bits1(gb); /* dflt_alter_scale */
-        e->sbr.dflt.noise_scale = get_bits(gb, 2); /* dflt_noise_scale */
+        e->sbr.dflt.noise_bands = get_bits(gb, 2); /* dflt_noise_bands */
     }
 
     e->sbr.dflt.limiter_bands = 2;