coding style: avoid unnecessary line continuations

Line continuation, adding a backslash as last char of the line, is
requested in multi-line macro definition, but is not necessary in
the rest of C code.

Remove it where present.

Identified by checkpatch script from Linux kernel v5.1 using the
command

	find src/ -type f -exec ./tools/scripts/checkpatch.pl \
	-q --types LINE_CONTINUATIONS -f {} \;

Change-Id: Id0c69e93456731717a7b290b16580e9f8ae741bc
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5619
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins

src/flash/nor/fespi.c

@@ -182,7 +182,7 @@ static int fespi_read_reg(struct flash_bank *bank, uint32_t *value, target_addr_
 }
 
 static int fespi_write_reg(struct flash_bank *bank, target_addr_t address, uint32_t value)
-{								\
+{
 	struct target *target = bank->target;
 	struct fespi_flash_bank *fespi_info = bank->driver_priv;