treewide: replace with error() with pr_err()

U-Boot widely uses error() as a bit noisier variant of printf().

This macro causes name conflict with the following line in
include/linux/compiler-gcc.h:

  # define __compiletime_error(message) __attribute__((error(message)))

This prevents us from using __compiletime_error(), and makes it
difficult to fully sync BUILD_BUG macros with Linux.  (Notice
Linux's BUILD_BUG_ON_MSG is implemented by using compiletime_assert().)

Let's convert error() into now treewide-available pr_err().

Done with the help of Coccinelle, excluing tools/ directory.

The semantic patch I used is as follows:

// <smpl>
@@@@
-error
+pr_err
 (...)
// </smpl>

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
[trini: Re-run Coccinelle]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/power/regulator/max77686.c b/drivers/power/regulator/max77686.c
index 8780806..2212d36 100644
--- a/drivers/power/regulator/max77686.c
+++ b/drivers/power/regulator/max77686.c
@@ -98,7 +98,7 @@
 	if (hex >= 0 && hex <= hex_max)
 		return hex;
 
-	error("Value: %d uV is wrong for BUCK%d", uV, buck);
+	pr_err("Value: %d uV is wrong for BUCK%d", uV, buck);
 	return -EINVAL;
 }
 
@@ -134,7 +134,7 @@
 	return uV;
 
 bad_hex:
-	error("Value: %#x is wrong for BUCK%d", hex, buck);
+	pr_err("Value: %#x is wrong for BUCK%d", hex, buck);
 	return -EINVAL;
 }
 
@@ -160,7 +160,7 @@
 	if (hex >= 0 && hex <= MAX77686_LDO_VOLT_MAX_HEX)
 		return hex;
 
-	error("Value: %d uV is wrong for LDO%d", uV, ldo);
+	pr_err("Value: %d uV is wrong for LDO%d", uV, ldo);
 	return -EINVAL;
 }
 
@@ -189,7 +189,7 @@
 	return uV;
 
 bad_hex:
-	error("Value: %#x is wrong for ldo%d", hex, ldo);
+	pr_err("Value: %#x is wrong for ldo%d", hex, ldo);
 	return -EINVAL;
 }
 
@@ -328,7 +328,7 @@
 
 	ldo = dev->driver_data;
 	if (ldo < 1 || ldo > MAX77686_LDO_NUM) {
-		error("Wrong ldo number: %d", ldo);
+		pr_err("Wrong ldo number: %d", ldo);
 		return -EINVAL;
 	}
 
@@ -366,7 +366,7 @@
 
 	buck = dev->driver_data;
 	if (buck < 1 || buck > MAX77686_BUCK_NUM) {
-		error("Wrong buck number: %d", buck);
+		pr_err("Wrong buck number: %d", buck);
 		return -EINVAL;
 	}
 
@@ -423,7 +423,7 @@
 
 	ldo = dev->driver_data;
 	if (ldo < 1 || ldo > MAX77686_LDO_NUM) {
-		error("Wrong ldo number: %d", ldo);
+		pr_err("Wrong ldo number: %d", ldo);
 		return -EINVAL;
 	}
 
@@ -493,7 +493,7 @@
 	}
 
 	if (mode == 0xff) {
-		error("Wrong mode: %d for ldo%d", *opmode, ldo);
+		pr_err("Wrong mode: %d for ldo%d", *opmode, ldo);
 		return -EINVAL;
 	}
 
@@ -545,7 +545,7 @@
 
 	buck = dev->driver_data;
 	if (buck < 1 || buck > MAX77686_BUCK_NUM) {
-		error("Wrong buck number: %d", buck);
+		pr_err("Wrong buck number: %d", buck);
 		return -EINVAL;
 	}
 
@@ -614,7 +614,7 @@
 	}
 
 	if (mode == 0xff) {
-		error("Wrong mode: %d for buck: %d\n", *opmode, buck);
+		pr_err("Wrong mode: %d for buck: %d\n", *opmode, buck);
 		return -EINVAL;
 	}