dvbsub: Check for errors from system()

libavcodec/dvbsubdec.c:145:5: warning: ignoring return value of ‘system’, declared with attribute warn_unused_result [-Wunused-result]
libavcodec/dvbsubdec.c:148:5: warning: ignoring return value of ‘system’, declared with attribute warn_unused_result [-Wunused-result]

1 files changed, 8 insertions, 2 deletions

diff --git a/libavcodec/dvbsubdec.c b/libavcodec/dvbsubdec.c
index ccdfc01089..e512b97a07 100644
--- a/libavcodec/dvbsubdec.c
+++ b/libavcodec/dvbsubdec.c
@@ -84,10 +84,16 @@ static void png_save(const char *filename, uint32_t *bitmap, int w, int h)
     fclose(f);
 
     snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
-    system(command);
+    if (system(command) != 0) {
+        printf("Error running pnmtopng\n");
+        return;
+    }
 
     snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
-    system(command);
+    if (system(command) != 0) {
+        printf("Error removing %s and %s\n", fname, fname2);
+        return;
+    }
 }
 #endif