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/pmic/as3722.c b/drivers/power/pmic/as3722.c
index 4efe8ee..3b0427e 100644
--- a/drivers/power/pmic/as3722.c
+++ b/drivers/power/pmic/as3722.c
@@ -46,14 +46,14 @@
 
 	ret = pmic_reg_read(dev, AS3722_ASIC_ID1);
 	if (ret < 0) {
-		error("failed to read ID1 register: %d", ret);
+		pr_err("failed to read ID1 register: %d", ret);
 		return ret;
 	}
 	*idp = ret;
 
 	ret = pmic_reg_read(dev, AS3722_ASIC_ID2);
 	if (ret < 0) {
-		error("failed to read ID2 register: %d", ret);
+		pr_err("failed to read ID2 register: %d", ret);
 		return ret;
 	}
 	*revisionp = ret;
@@ -71,7 +71,7 @@
 
 	ret = pmic_reg_write(dev, AS3722_SD_VOLTAGE(sd), value);
 	if (ret < 0) {
-		error("failed to write SD%u voltage register: %d", sd, ret);
+		pr_err("failed to write SD%u voltage register: %d", sd, ret);
 		return ret;
 	}
 
@@ -87,7 +87,7 @@
 
 	ret = pmic_reg_write(dev, AS3722_LDO_VOLTAGE(ldo), value);
 	if (ret < 0) {
-		error("failed to write LDO%u voltage register: %d", ldo,
+		pr_err("failed to write LDO%u voltage register: %d", ldo,
 		      ret);
 		return ret;
 	}
@@ -102,12 +102,12 @@
 
 	ret = as3722_read_id(dev, &id, &revision);
 	if (ret < 0) {
-		error("failed to read ID: %d", ret);
+		pr_err("failed to read ID: %d", ret);
 		return ret;
 	}
 
 	if (id != AS3722_DEVICE_ID) {
-		error("unknown device");
+		pr_err("unknown device");
 		return -ENOENT;
 	}