Staging: fbtft: clean dev_err() logging

This patch removes  __func__ from dev_err. dev_err includes information about:
(devcice, driver, specific instance of device, etc) in the log printout.
This was done using Coccinelle, with the following semantic patch:

@a@
expression E, R;
expression  msg;
@@

dev_err(E, msg, __func__, R);

@script:python b@
e << a.msg;
y;
@@

if(e.find("%s: ") == True):
	m = e.replace("%s: ", "", 1);
	coccinelle.y = m;
elif(e.find("%s ") == True):
	m = e.replace("%s ", "", 1);
	coccinelle.y = m;
elif(e.find("%s:") == True):
	m = e.replace("%s:", "", 1);
	coccinelle.y = m;
else:
	m = e.replace("%s", "",1);
	coccinelle.y = m;

@c@
expression a.E, a.msg, a.R;
identifier  b.y;
@@

- dev_err(E, msg, __func__, R);
+ dev_err(E, y, R);

Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/fbtft/fbtft-io.c b/drivers/staging/fbtft/fbtft-io.c
index 9b2f8cf..e19b814 100644
--- a/drivers/staging/fbtft/fbtft-io.c
+++ b/drivers/staging/fbtft/fbtft-io.c
@@ -59,8 +59,7 @@
 	}
 	if ((len % 8) != 0) {
 		dev_err(par->info->device,
-			"%s: error: len=%zu must be divisible by 8\n",
-			__func__, len);
+			"error: len=%zu must be divisible by 8\n", len);
 		return -EINVAL;
 	}
 
@@ -106,8 +105,8 @@
 	if (par->startbyte) {
 		if (len > 32) {
 			dev_err(par->info->device,
-				"%s: len=%zu can't be larger than 32 when using 'startbyte'\n",
-				__func__, len);
+				"len=%zu can't be larger than 32 when using 'startbyte'\n",
+				len);
 			return -EINVAL;
 		}
 		txbuf[0] = par->startbyte | 0x3;