Fixed broken sprintf() invocation.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36087 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/libroot/posix/glibc/stdio-common/perror.c

@@ -44,7 +44,7 @@ perror(const char *s)
 		colon = ": ";
 
 	if (strerror_r(errno, buffer, sizeof(buffer)) != 0)
-		sprintf("Unknown error %ld", errno);
+		snprintf(buffer, sizeof(buffer), "Unknown error %d", errno);
 
 	fprintf(stderr, "%s%s%s\n", s, colon, buffer);
 }