Fix a couple of 'return type defaults to int' and 'control reaches end of

non-void function' warnings in test code.

Originally committed as revision 11491 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/adler32.c

@@ -66,5 +66,6 @@ int main(void){
         STOP_TIMER("adler")
     }
     av_log(NULL, AV_LOG_DEBUG, "%X == 50E6E508\n", checksum);
+    return 0;
 }
 #endif

libavutil/crc.c

@@ -130,7 +130,7 @@ uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t le
 
 #ifdef TEST
 #undef printf
-main(void){
+int main(void){
     uint8_t buf[1999];
     int i;
     int p[4][3]={{AV_CRC_32_IEEE_LE, 0xEDB88320, 0x3D5CDD04},
@@ -146,5 +146,6 @@ main(void){
         ctx = av_crc_get_table(p[i][0]);
         printf("crc %08X =%X\n", p[i][1], av_crc(ctx, 0, buf, sizeof(buf)));
     }
+    return 0;
 }
 #endif

libavutil/integer.c

@@ -171,7 +171,7 @@ const uint8_t ff_log2_tab[256]={
         7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
 };
 
-main(void){
+int main(void){
     int64_t a,b;
 
     for(a=7; a<256*256*256; a+=13215){
@@ -192,5 +192,6 @@ main(void){
             assert(av_i2int(av_div_i(ai,bi)) == a/b);
         }
     }
+    return 0;
 }
 #endif

libavutil/mathematics.c

@@ -114,7 +114,7 @@ int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq){
 #ifdef TEST
 #include "integer.h"
 #undef printf
-main(void){
+int main(void){
     int64_t a,b,c,d,e;
 
     for(a=7; a<(1LL<<62); a+=a/3+1){
@@ -136,5 +136,6 @@ main(void){
             }
         }
     }
+    return 0;
 }
 #endif

libavutil/md5.c

@@ -164,7 +164,7 @@ void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len){
 #ifdef TEST
 #include <stdio.h>
 #undef printf
-main(void){
+int main(void){
     uint64_t md5val;
     int i;
     uint8_t in[1000];
@@ -176,5 +176,7 @@ main(void){
     av_md5_sum( (uint8_t*)&md5val, in,  65); printf("%"PRId64"\n", md5val);
     for(i=0; i<1000; i++) in[i]= i % 127;
     av_md5_sum( (uint8_t*)&md5val, in,  999); printf("%"PRId64"\n", md5val);
+
+    return 0;
 }
 #endif