cocci: Add spatch/coccinelle patches for driver porting

This is an impartial set of transformations to help port the drivers to
the new interfaces.

cocci/00-misc-cleanups.cocci

@@ -0,0 +1,78 @@
+// Remove USB device reset, lets hope that we do not need this.
+// If we do, maybe do it elsewhere?
+@@
+identifier r;
+@@
+- r = libusb_reset_device(...);
+- if (r != 0) { ... }
+
+// Functions that have uneccessary returns (i.e. error cannot happen after refactoring)
+// NOTE: Make sure that these function are fine to modify in *all* drivers!
+@ prior_int_func @
+identifier func =~ "capture_chunk_async|alksdjflkajsfd";
+expression res, res2;
+@@
+-int func
++void func
+ (...)
+{
+	<...
+-		return res2;
++		res2;
+	...>
+-	return res;
++	res;
+}
+
+@@
+identifier prior_int_func.func;
+identifier res;
+@@
+-res = func
++func
+ (...);
+(
+-if (res < 0) { ... }
+|
+-if (res != 0) { ... }
+)
+
+// Remove useless checks of fpi_timeout_add return values
+@@
+expression a1, a2, a3, a4;
+@@
+-if (fpi_timeout_add(a1, a2, a3, a4) == NULL) { ... }
++fpi_timeout_add(a1, a2, a3, a4);
+
+@@
+identifier timeout;
+expression a1, a2, a3, a4;
+@@
+timeout = fpi_timeout_add(a1, a2, a3, a4);
+-if (timeout == NULL) { ... }
+
+
+// The VFS5011 driver has some stupid "radiation detected" logic, that should be asserts
+@@
+expression expr;
+@@
+-if ((expr)) {
+-  ...
+-  fp_err("Radiation detected!");
+-  ...
+-}
++g_assert(!expr);
+
+
+// A number of drivers call both fpi_imgdev_session_error *and* fpi_ssm_mark_failed.
+// While this worked fine, it is plain wrong and considerably complicates memory
+// management of the errors.
+// Remove this duplication
+@@
+expression dev;
+expression ssm;
+expression error;
+@@
+-	fpi_imgdev_session_error(dev, error);
+	fpi_ssm_mark_failed(ssm, error);
+