Silence "string-plus-int" warning shown by clang.

libswscale/utils.c:89:42: warning: adding 'unsigned long' to a string does not append to the string [-Wstring-plus-int]

libavcodec/utils.c

@@ -1444,7 +1444,7 @@ const char *avcodec_configuration(void)
 const char *avcodec_license(void)
 {
 #define LICENSE_PREFIX "libavcodec license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+    return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
 }
 
 int av_get_exact_bits_per_sample(enum AVCodecID codec_id)

libavdevice/avdevice.c

@@ -75,7 +75,7 @@ const char * avdevice_configuration(void)
 const char * avdevice_license(void)
 {
 #define LICENSE_PREFIX "libavdevice license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+    return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
 }
 
 static void *device_next(void *prev, int output,

libavfilter/avfilter.c

@@ -88,7 +88,7 @@ const char *avfilter_configuration(void)
 const char *avfilter_license(void)
 {
 #define LICENSE_PREFIX "libavfilter license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+    return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
 }
 
 void ff_command_queue_pop(AVFilterContext *filter)

libavformat/utils.c

@@ -77,7 +77,7 @@ const char *avformat_configuration(void)
 const char *avformat_license(void)
 {
 #define LICENSE_PREFIX "libavformat license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+    return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
 }
 
 int ff_lock_avformat(void)

libavutil/utils.c

@@ -70,7 +70,7 @@ const char *avutil_configuration(void)
 const char *avutil_license(void)
 {
 #define LICENSE_PREFIX "libavutil license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+    return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
 }
 
 const char *av_get_media_type_string(enum AVMediaType media_type)

libpostproc/postprocess.c

@@ -108,7 +108,7 @@ const char *postproc_configuration(void)
 const char *postproc_license(void)
 {
 #define LICENSE_PREFIX "libpostproc license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+    return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
 }
 
 #define GET_MODE_BUFFER_SIZE 500

libswresample/swresample.c

@@ -46,7 +46,7 @@ const char *swresample_configuration(void)
 const char *swresample_license(void)
 {
 #define LICENSE_PREFIX "libswresample license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+    return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
 }
 
 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){

libswscale/utils.c

@@ -86,7 +86,7 @@ const char *swscale_configuration(void)
 const char *swscale_license(void)
 {
 #define LICENSE_PREFIX "libswscale license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+    return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
 }
 
 typedef struct FormatEntry {