Fix compilation problems in 'amp' plugin.

Four instances where 'default:' is at the end of a block replaced with
'default: break;' (reported by mscherer).

One typo where [j] should have been [1] (array out of bounds error).

Missing <unistd.h> includes for _exit(), and <string.h> for memcpy().

dll/amp/getdata.c

@@ -261,7 +261,7 @@ int j,k;
 				for (k=0;k<6;k++) 
 				{
 					scalefac_l[0][ch][sfb]=getbits(slen[1]);
-					i+=slen[j];
+					i+=slen[1];
 					if (ch) is_max[sfb]=(1<<slen[1])-1;
 					sfb++;
 				}

dll/amp/huffman.c

@@ -12,6 +12,8 @@
 #define HUFFMAN
 #include "huffman.h"
 
+#include <unistd.h>
+
 static inline unsigned int viewbits(int n)
 {
 unsigned int pos,ret_value;

dll/amp/layer2.c

@@ -77,7 +77,7 @@ int hsize,fs,mean_frame_size;
 					   nbal=&t_nbal2;
 					   sblimit=8;
 					   break;
-				default  : /*printf(" bit alloc info no gud ");*/
+				default  : break;
 				}
 				break;
 		case 1 : switch (bitrate)	/* 1 = 48 kHz */
@@ -98,7 +98,7 @@ int hsize,fs,mean_frame_size;
 					   nbal=&t_nbal2;
 					   sblimit=8;
 					   break;
-				default  : /*printf(" bit alloc info no gud ");*/
+				default  : break;
 				}
 				break;
 		case 2 : switch (bitrate)	/* 2 = 32 kHz */
@@ -122,10 +122,10 @@ int hsize,fs,mean_frame_size;
                                    nbal=&t_nbal3;
                                    sblimit=12;
 				   break;
-			default  : /*printf("bit alloc info not ok\n");*/
+			default  : break;
 			}
 	                break;                                                    
-		default  : /*printf("sampling freq. not ok/n");*/
+		default  : break;
 	} else {
 		bit_alloc_index=&t_allocMPG2;
 		nbal=&t_nbalMPG2;

dll/amp/position.c

@@ -11,6 +11,8 @@
 #define POSITION
 #include "position.h"
 
+#include <string.h>
+
 /* Returns the number of frames actually skipped, -1 on error.
  *
  * Values in header are not changed if retval!=nframes.

dll/amp/util.c

@@ -10,6 +10,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <string.h>
+#include <unistd.h>
 
 #include "audio.h"