Ingore SIGPIPE errors

If MTP exits unexpectedly, sending messages to add or remove a
storage device via Add_Remove_MTP_Storage was causing a crash.
Ignoring SIGPIPE allows us to more gracefully handle the error
instead of a total crash of TWRP.

Change-Id: I0a3f770f8b0f4bdbe10aa0ba857209b22b8668f7

twrp.cpp

@@ -20,6 +20,7 @@
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
+#include <signal.h>
 
 #include "cutils/properties.h"
 extern "C" {
@@ -72,6 +73,8 @@ int main(int argc, char **argv) {
 	freopen(TMP_LOG_FILE, "a", stderr);
 	setbuf(stderr, NULL);
 
+	signal(SIGPIPE, SIG_IGN);
+
 	// Handle ADB sideload
 	if (argc == 3 && strcmp(argv[1], "--adbd") == 0) {
 		adb_main(argv[2]);