sbcenc: Fix build warnings

This fixes the following warnings:

In file included from /usr/include/stdio.h:894,
         from src/sbcenc.c:30:
In function ‘fprintf’,
  inlined from ‘encode’ at src/sbcenc.c:160:3,
  inlined from ‘main’ at src/sbcenc.c:329:3:
/usr/include/bits/stdio2.h:105:10: error: ‘srate’ may be
used uninitialized [-Werror=maybe-uninitialized]
 105 |  return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
   |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 106 |             __va_arg_pack ());
   |             ~~~~~~~~~~~~~~~~~
src/sbcenc.c: In function ‘main’:
src/sbcenc.c:54:23: note: ‘srate’ was declared here
  54 |     int fd, size, srate, codesize, nframes;
   |            ^~~~~
cc1: all warnings being treated as errors

1 files changed, 3 insertions, 4 deletions

diff --git a/src/sbcenc.c b/src/sbcenc.c
index 6f8d794..1798cde 100644
--- a/src/sbcenc.c
+++ b/src/sbcenc.c
@@ -89,6 +89,8 @@ static void encode(char *filename, int subbands, int bitpool, int joint,
 		goto done;
 	}
 
+	srate = BE_INT(au_hdr.sample_rate);
+
 	if (!msbc) {
 		sbc_init(&sbc, 0L);
 
@@ -111,8 +113,6 @@ static void encode(char *filename, int subbands, int bitpool, int joint,
 			goto done;
 		}
 
-		srate = BE_INT(au_hdr.sample_rate);
-
 		sbc.subbands = subbands == 4 ? SBC_SB_4 : SBC_SB_8;
 
 		if (BE_INT(au_hdr.channels) == 1) {
@@ -141,8 +141,7 @@ static void encode(char *filename, int subbands, int bitpool, int joint,
 				blocks == 8 ? SBC_BLK_8 :
 					blocks == 12 ? SBC_BLK_12 : SBC_BLK_16;
 	} else {
-		if (BE_INT(au_hdr.sample_rate) != 16000 ||
-				BE_INT(au_hdr.channels) != 1) {
+		if (srate != 16000 || BE_INT(au_hdr.channels) != 1) {
 			fprintf(stderr, "mSBC requires 16 bits, 16kHz, mono "
 								"input\n");
 			goto done;